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{{Short description|Market structure with one buyer}}
{{Competition law}}
{{restrictive market structures}}

In [[economics]], a '''monopsony''' is a [[market structure]] in which a single buyer substantially controls the market as the major purchaser of goods and services offered by many would-be sellers. The [[Microeconomics|microeconomic]] theory of monopsony assumes a single entity to have market power over all sellers as the only purchaser of a good or service. This is a similar power to that of a [[monopolist]], which can influence the price for its buyers in a [[monopoly]], where multiple buyers have only one seller of a good or service available to purchase from.

==History==
Monopsony theory was developed by economist [[Joan Robinson]] in her book ''[[The Economics of Imperfect Competition]]'' (1933).<ref name="RobinsonAssessments" /> Economists use the term "monopsony power" in a manner similar to "monopoly power", as a shorthand reference for a scenario in which there is one dominant power in the buying relationship, so that power is able to set prices to maximize profits not subject to competitive constraints. Monopsony power exists when one buyer faces little competition from other buyers for that labour or good, so they are able to set wages or prices for the labour or goods they are buying at a level lower than would be the case in a competitive market. In economic literature the term "monopsony" is predominantly used when referring to labour markets,<ref name=":0">{{Cite journal|last1=Ashenfelter|first1=Orley|last2=Farber|first2=Henry|last3=Ransom|first3=Michael|date=2010|title=Labor Market Monopsony|url=https://www.jstor.org/stable/10.1086/653654|journal=Journal of Labor Economics|volume=28|issue=2|pages=203–210|doi=10.1086/653654|jstor=10.1086/653654|s2cid=154920182|issn=0734-306X}}</ref> however could be applied to any industry, good or service where a buyer has market power over all sellers.

A classic theoretical example is a [[mining town]], where the company that owns the mine is able to set wages low since they face no competition from other employers in hiring workers, because they are the only employer in the town, and geographic isolation or obstacles prevent workers from seeking employment in other locations. Other more current examples may include school districts where teachers have little mobility across districts. In such cases the district faces little competition from other schools in hiring teachers, giving the district increased power when negotiating employment terms.<ref>{{Cite journal|last1=Ransom|first1=Michael|last2=Sims|first2=David|date=2010|title=Estimating the Firm's Labor Supply Curve in a 'New Monopsony' Framework: Schoolteachers in Missouri|url=https://www.jstor.org/stable/10.1086/649904|journal=Journal of Labor Economics|volume=28|issue=2|pages=331–355|doi=10.1086/649904|jstor=10.1086/649904|s2cid=19545337|issn=0734-306X|hdl=10419/35295|hdl-access=free}}</ref> Alternative terms are [[oligopsony]] or monopsonistic competition.

===Etymology===
The term "monopsony" (from [[Ancient Greek|Greek]] μόνος (''mónos'') "single" and ὀψωνεῖν (''opsōneîn'') "to purchase fish")<ref name="jep" /> was first introduced by the British economist [[Joan Robinson]] in her influential<ref name="RobinsonAssessments">{{Cite book|last=Robinson|first=Joan|date=1969|title=The Economics of Imperfect Competition|url=https://link.springer.com/book/10.1007/978-1-349-15320-6|language=en-gb|doi=10.1007/978-1-349-15320-6|isbn=978-0-333-10289-3}}</ref> book, ''The Economics of Imperfect Competition'', published in 1933. Robinson credited classics scholar [[Bertrand Hallward]] of [[the University of Cambridge]] with coining the term.<ref name="jep">{{cite journal | title=Retrospectives: How Joan Robinson and B. L. Hallward Named Monopsony | author=Thornton, Robert J. | journal=Journal of Economic Perspectives | year=2004 | volume=18 | issue=2 | pages=257–261 | doi=10.1257/0895330041371240 | doi-access=free }}</ref>{{efn|Thornton argues that ὀψωνεῖν refers chiefly to buying fish or cooked meat and is therefore not an ideal choice of word.<ref name="jep" /> The word also underlies the medical term [[opsonin]]s, referring to proteins which help to destroy bacteria.<ref>{{Cite journal |last1=Wright |first1=A. E. |last2=Douglas |first2=S. R. |last3=Sanderson |first3=J. B. |date=September 1989 |title=An experimental investigation of the rôle of the blood fluids in connection with phagocytosis. 1903 |url=https://royalsocietypublishing.org/doi/pdf/10.1098/rspl.1903.0062 |journal=Reviews of Infectious Diseases |volume=11 |issue=5 |pages=827–834 |doi=10.1093/clinids/11.5.827 |pmid=2682954|access-date=13 December 2024}}</ref>}}

==Static monopsony in a labour market==
[[File:Monopsony-static-partial-equilibrium.svg|thumb|300px|right|A monopsonist employer maximizes profits by choosing the employment level ''L'', that equates the marginal revenue product (''MRP'') to the marginal cost ''MC'', at point ''A''. The wage is then determined on the labour supply curve, at point ''M'',  and is equal to ''w''. By contrast, a competitive labour market would reach equilibrium at point ''C'', where labour supply ''S''&nbsp; equals demand.  This would lead to employment ''L'&nbsp;'' and wage ''w'.'']]

The standard textbook monopsony model of a labour market is a static [[partial equilibrium]] model with just one employer who pays the same wage to all the workers.<ref name=":2" /> The employer faces an upward-sloping ''labour supply curve''<ref name=":0" /> (as generally contrasted with an infinitely elastic labour supply curve), represented by the ''S'' blue curve in the diagram on the right. This curve relates the wage paid, <math>w</math>, to the level of employment, <math>L</math>,  and is denoted as an increasing function <math>w(L)</math>. Total labour costs are given by <math>w(L)\cdot L</math>.  The firm has total revenue <math>R</math>, which increases with <math>L</math>. The firm wants to choose  <math>L</math> to maximize profit, <math>P</math>, which is given by:

:<math>P(L)=R(L)-w(L)\cdot L\,\!</math>.

At the maximum profit <math>P'(L) = 0</math>, so the first-order condition for maximization is

:<math>0=R'(L) - w'(L)\cdot L-w(L)</math>

where <math>w'(L)</math> is the derivative of the function <math>w(L),</math> implying

:<math>R'(L)=w'(L)\cdot L+w(L).</math>

The left-hand side of this expression, <math>R'(L)</math>, is the ''[[marginal revenue product]]'' of labour (roughly, the extra revenue generated by an extra worker) and is represented by the red ''MRP'' curve in the diagram. The right-hand side is the ''[[marginal cost]]'' of labour (roughly, the extra cost due to an extra worker) and is represented by the green ''MC'' curve in the diagram. Notably, the marginal cost is ''higher'' than the wage <math>w(L)</math> paid to the new worker by the amount

:<math>w'(L)L\,\!</math>.

This is because, by assumption, the firm has to increase the wage paid to all the workers it already employs whenever it hires an extra worker. In the diagram, this leads to an ''MC'' curve that is ''above'' the labour supply curve ''S''.

The first-order condition for maximum profit is then satisfied at point ''A'' of the diagram, where the ''MC'' and ''MRP'' curves intersect. This determines the profit-maximizing employment as ''L'' on the horizontal axis. The corresponding wage ''w'' is then obtained from the supply curve, through point ''M''.

The monopsonistic equilibrium at ''M'' can be contrasted with the equilibrium that would obtain under competitive conditions. Suppose a competitive employer entered the market and offered a wage higher than that at ''M''. Then every employee of the first employer would choose instead to work for the competitor. Moreover, the competitor would gain all the former profits of the first employer, minus a less-than-offsetting amount from the wage increase of the first employer's employees, plus profit arising from additional employees who decided to work in the market because of the wage increase. But the first employer would respond by offering an even higher wage, poaching the new rival's employees, and so forth. As a result, a group of perfectly competitive firms would be forced, through [[competition]], to intersection ''C'' rather than ''M''. Just as a [[monopoly]] is thwarted by the competition to win sales, minimizing prices and maximizing output, competition for employees between the employers in this case would maximize both wages and employment.

===Welfare implications===
[[File:Monopsony-welfare-effects.svg|right|thumb|300px|The grey rectangle is a measure of the amount of economic welfare transferred from the workers to their employer(s) by monopsony power. The yellow triangle shows the ''overall deadweight loss'' inflicted on both groups by the monopsonistic restriction of employment. It is thus a measure of the ''market failure'' caused by monopsony.]]
The lower employment and wages caused by monopsony power have two distinct effects on the economic welfare of the people involved. Firstly, it redistributes welfare away from workers and to their employer(s).<ref name=":0" /> Secondly, it reduces the aggregate (or social) welfare enjoyed by both groups taken together, as the employers' net gain is smaller than the loss inflicted on workers.

The diagram on the right illustrates both effects, using the standard approach based on the notion of [[economic surplus]]. According to this notion, the workers' economic surplus (or net gain from the exchange) is given by the area between the ''S'' curve and the horizontal line corresponding to the wage, up to the employment level. Similarly, the employers' surplus is the area between the horizontal line corresponding to the wage and the ''MRP'' curve, up to the employment level. The ''social'' surplus is then the sum of these two areas.<ref name=":1" />

Following such definitions, the grey rectangle, in the diagram, is the part of the competitive social surplus that has been redistributed from the workers to their employer(s) under monopsony. By contrast, the yellow triangle is the part of the competitive social surplus that has been lost by ''both'' parties, as a result of the monopsonistic restriction of employment.<ref name=":1">{{Cite book|last1=Blair|first1=Roger D.|url=https://books.google.com/books?id=_TwO_9cH9TcC&q=Monopsony+in+Law+and+Economics&pg=PR1|title=Monopsony in Law and Economics|last2=Harrison|first2=Jeffrey L.|year=2010|publisher=Cambridge University Press|isbn=978-1-139-49097-9|language=en}}</ref> This is a net social loss and is called ''[[deadweight loss]]''. It is a measure of the [[market failure]] caused by monopsony power, through a wasteful misallocation of resources.

As the diagram suggests, the size of both effects increases with the difference between the marginal revenue product ''MRP'' and the market wage determined on the supply curve ''S''. This difference corresponds to the vertical side of the yellow triangle, and can be expressed as a proportion of the market wage, according to the formula:

:<math>e=\frac{R'(w)-w}{w}\,\!</math>.

The ratio <math>e</math> has been called the [[rate of exploitation]], and it can be easily shown that it equals the reciprocal of the elasticity of the labour supply curve faced by the firm. Thus the rate of exploitation<ref>{{Cite journal|last=Flatau|first=Paul|date=2001-01-01|title=Some Reflections on the 'Pigou-Robinson' Theory of Exploitation|url=https://doi.org/10.1080/10370196.2001.11733346|journal=History of Economics Review|volume=33|issue=1|pages=1–16|doi=10.1080/10370196.2001.11733346|s2cid=55190294|issn=1037-0196}}</ref> is zero under competitive conditions, when this elasticity tends to infinity. Empirical estimates of <math>e</math> by various means are a common feature of the applied literature devoted to the measurement of observed monopsony power.

Finally, it is important to notice that, while the gray-area redistribution effect could be reversed by fiscal policy (i.e., taxing employers and transferring the tax revenue to the workers), this is not so for the yellow-area deadweight loss. The market failure can only be addressed in one of two ways: either by breaking up the monopsony through anti-trust intervention, or by regulating the wage policy of firms. The most common kind of regulation is a binding [[minimum wage]] higher than the monopsonistic wage.

===Minimum wage===
[[File:Monopsony-minimum-wage.svg|thumb|300px|right|With a binding minimum wage of ''w{{'}}'&nbsp;'' the marginal cost to the firm becomes the horizontal black ''MC'&nbsp;'' line, and the firm [[Profit maximization|maximises profits]] (which it can do due to a lack of competition) at ''A'' with a higher employment ''L{{'}}'.'' However, in this example, the minimum wage is higher than the competitive one, leading to ''[[involuntary unemployment]]'' equal to the segment ''AB''.]]

A binding minimum wage can be introduced either directly by law or through collective bargaining laws requiring union membership.  While it is generally agreed that minimum wage price floors reduce employment,<ref name="auto">{{cite web|url=https://www.epionline.org/wp-content/studies/Neumark_2007.pdf|year=2007|title=Minimum Wage Effects in the Post-welfare Reform Era|url-status=live|archive-url=https://web.archive.org/web/20180506194217/https://www.epionline.org/wp-content/studies/Neumark_2007.pdf|archive-date=2018-05-06}}</ref>  economic literature has yet to form a consensus regarding the effects in the presence of monopsony power.<ref name=":2">{{Cite book|last=Manning|first=Alan|url=https://www.jstor.org/stable/j.ctt5hhpvk|title=Monopsony in Motion: Imperfect Competition in Labor Markets|publisher=Princeton University Press|year=2003|isbn=978-0-691-12328-8|location=Princeston University Press|doi=10.2307/j.ctt5hhpvk |jstor=j.ctt5hhpvk}}</ref> Some studies have shown that if monopsony power is present within a labour market the effect is reversed and a minimum wage ''could'' increase employment.<ref>{{Cite journal|last=Stigler|first=George J.|date=1946|title=The Economics of Minimum Wage Legislation|url=https://www.jstor.org/stable/1801842|journal=The American Economic Review|volume=36|issue=3|pages=358–365|jstor=1801842|issn=0002-8282}}</ref>

This effect is demonstrated in the diagram on the right.

Here the minimum wage is {{var|w}}<nowiki>''</nowiki>, higher than the monopsonistic {{var|w}}. Because of the binding effects of minimum wage and the excess supply of labour (as defined by the monopsony status), the marginal cost of labour for the firm becomes constant (the price of hiring an additional worker rather than the increasing cost as labour becomes more scarce).<ref>{{cite web|url=http://econlog.econlib.org/archives/2015/02/the_minimum_wag_4.html|title=The Minimum Wage and Monopsony|year=2015|work=The Library of Economics and Liberty|url-status=live|archive-url=https://web.archive.org/web/20180213195056/http://econlog.econlib.org/archives/2015/02/the_minimum_wag_4.html|archive-date=2018-02-13}}</ref> This means that the firm maximizes profit at the intersection of the new marginal cost line ({{var|MC}}' in the diagram) and Marginal Revenue Product line (the additional revenue for selling one more unit).<ref>{{cite web|url=http://econlog.econlib.org/archives/2013/02/the_minimum_wag_2.html|title=The Minimum Wage and Monopsony|year=2013|work=The Library of Economics and Liberty|url-status=live|archive-url=https://web.archive.org/web/20180213021850/http://econlog.econlib.org/archives/2013/02/the_minimum_wag_2.html|archive-date=2018-02-13}}</ref> This is the point where it becomes more expensive to produce an additional item than is earned in revenue from selling that item.

This condition is still inefficient compared to a competitive market.  The line segment represented by A—B shows that there are still workers who would like to find a job, but cannot due to the monopsonistic nature of this industry.  This would represent the unemployment rate for this industry. This illustrates that there will be deadweight loss in a monopsonistic labour environment regardless of minimum wage levels, however a minimum wage law can increase total employment within the industry.

More generally, a binding minimum wage modifies the form of the supply curve faced by the firm, which becomes:

:<math>w=\begin{cases}w_{min},&\mbox{if }w_{min}\ge\;w(L)\\w(L), &\mbox{if }w_{min}\le\;w(L)\end{cases}\,\!</math>

where <math>w(L)</math> is the original supply curve and <math>w_{min}</math> is the minimum wage. The new curve has thus a horizontal first branch and a kink at the point

:<math> w(L)=w_{min}\,\!</math>

as is shown in the diagram by the kinked black curve ''MC' S'' (the black curve to the right of point B). The resulting equilibria (the profit-maximizing choices that rational companies will make) can then fall into one of three classes according to the value taken by the minimum wage, as shown by the following table:

{| class="wikitable" style="text-align:center"
|+ Profit-maximizing choice in a monopsonistic labour market depends upon the minimum wage level
|-
!
! Minimum wage
! Resulting equilibrium
|-
! First Case
| < monopsony wage
| where the monopsony wage intersects the supply curve (S)
|-
! Second Case
| > monopsony wage <br /> but <br /> ≤ competitive wage (the intersection of S and MRP)
| at the intersection of the minimum wage and the supply curve (S)
|-
! Third Case
| > competitive wage
| at intersection where minimum wage equals ''MRP''
|}

Yet, even when it is sub-optimal, a minimum wage higher than the monopsonistic rate can raises the level of employment anyway. This is a highly remarkable result because it only follows under monopsony. Indeed, under competitive conditions any minimum wage higher than the market rate would actually ''reduce'' employment, according to classical economic models and the consensus of peer-reviewed work.<ref name="auto">{{cite web|url=https://www.epionline.org/wp-content/studies/Neumark_2007.pdf|year=2007|title=Minimum Wage Effects in the Post-welfare Reform Era|url-status=live|archive-url=https://web.archive.org/web/20180506194217/https://www.epionline.org/wp-content/studies/Neumark_2007.pdf|archive-date=2018-05-06}}</ref> Thus, spotting the effects on employment of newly introduced minimum wage regulations is among the indirect ways economists use to pin down monopsony power in selected labour markets.  This technique was used, for example in a series of studies looking at the American labour market that found monopsonies existed only in several specialized fields such as professional sports and college professors.<ref name="auto1">{{cite web|url=http://eh.net/encyclopedia/monopsony-in-american-labor-markets/|year=2017|title=Monopsony in American Labor Markets|url-status=live|archive-url=https://web.archive.org/web/20180319225003/https://eh.net/encyclopedia/monopsony-in-american-labor-markets/|archive-date=2018-03-19}}</ref><ref>{{cite web|url=http://www.dartmouth.edu/~dstaiger/Papers/2010/staiger%20spetz%20phibbs%20monopsony%20jole%202010.pdf|year=2010|title=Is There Monopsony in the Labor Market? Evidence from a Natural Experiment|url-status=live|archive-url=https://web.archive.org/web/20170809040652/http://www.dartmouth.edu/~dstaiger/Papers/2010/staiger%20spetz%20phibbs%20monopsony%20jole%202010.pdf|archive-date=2017-08-09}}</ref>

===Wage discrimination===
Just like a monopolist, a monopsonistic employer may find that its profits are maximized if it [[Price discrimination|''discriminates'' prices]]. In this case the company pays different wages to different groups of workers (even if their MRP is the same), with lower wages paid to the workers who have a lower elasticity of supply of their labour to the firm.

Researchers have used this fact to explain at least part of the observed wage differentials whereby [[Equal pay for women|women often earn less than men]], even after controlling for observed productivity differentials. Robinson's original application of monopsony (1938) was developed to explain wage differentials between equally productive women and men.<ref name=":3">{{cite web |author=R.L. Oaxaca |title=Notes on Monopsony Model of Gender Wage Gaps |publisher=University of Arizona |url=http://www.u.arizona.edu/~rlo/696i/Monopsony_Model_Latex.pdf |access-date=2014-02-01 |url-status=live |archive-url=https://web.archive.org/web/20140203115043/http://www.u.arizona.edu/~rlo/696i/Monopsony_Model_Latex.pdf |archive-date=2014-02-03 }}</ref> Ransom and Oaxaca (2004) found that women's wage elasticity is lower than that of men for employees at a grocery store chain in Missouri, controlling for other factors typically associated with wage determination.<ref>http://dataspace.princeton.edu/jspui/bitstream/88435/dsp01nk322d34x/1/540.pdf {{Bare URL PDF|date=March 2022}}</ref> Ransom and Lambson (2011) found that female teachers are paid less than male teachers due to differences in labour market mobility constraints facing women and men.<ref>{{cite journal|url=http://www.econbiz.de/Record/monopsony-mobility-and-sex-differences-in-pay-missouri-school-teachers-ransom-michael/10009267099|title=Monopsony, mobility, and sex differences in pay : Missouri school teachers|volume=101|issue=3|year=2011|journal=Econbiz.de|url-status=live|archive-url=https://web.archive.org/web/20140203110219/http://www.econbiz.de/Record/monopsony-mobility-and-sex-differences-in-pay-missouri-school-teachers-ransom-michael/10009267099|archive-date=2014-02-03|series=The American economic review| location=Nashville, TN |publisher=American Economic Assoc. |ISSN=0002-8282|pages=454–459|last1=Ransom|first1=Michael R.|last2=Lambson|first2=Val Eugene}}</ref>

Some authors have argued informally that, while this is so for ''market'' supply, the reverse may somehow be true of the supply to individual firms. In particular, Manning and others have shown that, in the case of the [[Equal Pay Act 1970|UK Equal Pay Act]], implementation has led to higher employment of women. Since the Act was effectively minimum wage legislation for women, this might perhaps be interpreted as a symptom of monopsonistic discrimination.

Standard labor market models assume that workers have accurate information about their outside options and subsequently negotiate with their employer to raise their wages so they match outside offers or switch jobs. However, a 2024 study of German workers in the ''Quarterly Journal of Economics'' found that they severely underestimated the wages that they would earn at other jobs. This underestimation of outside wages could contribute to monopsony power for employers.<ref>{{Cite report |url=https://doi.org/10.1093/qje/qjae001 |title=Worker Beliefs About Outside Options |last1=Jäger |first1=Simon |last2=Roth |first2=Christopher |date=2024 |journal=Quarterly Journal of Economics |last3=Roussille |first3=Nina |last4=Schoefer |first4=Benjamin|volume=139 |issue=3 |pages=1505–1556 |doi=10.1093/qje/qjae001 |hdl=10419/250624 |hdl-access=free }}</ref>

== Dynamic models of monopsony ==
More recent labor market models of monopsony<ref name=":2" /><ref name=":0" /> have indicated that some monopsonistic power is likely present in otherwise competitive markets. Its cause can be linked to [[imperfect information]] as a result of search frictions.<ref name=":0" /> This may indicate companies operating under competitive market conditions have some limited discretion to manipulate wage rates without losing employees to competitors that is associated with the search friction in that market (ie how hard it is to find and secure another job). This modern perspective of dynamic monopsony<ref name=":2" /> first proposed by [[Alan Manning|Allan Manning]] (2003), also results in an upward sloping labor supply curve, and is more practical as it incorporates multiple employers in a competitive market whilst also allowing for search frictions, and a costly search.<ref name=":3" />

==Empirical problems==

The simpler explanation of monopsony power in labour markets is barriers to entry on the demand side. Such barriers to entry would result in a limited number of companies competing for labour (oligopsony). If the hypothesis was generally true, one would expect to find that wages decreased as firm size increased or, more accurately, as industry concentration increased.  However, numerous statistical studies document significant positive correlations between firm or establishment size and wages.<ref>{{Cite journal|last1=Green|first1=Francis|last2=Machin|first2=Stephen|last3=Manning|first3=Alan|date=1996|title=The Employer Size–Wage Effect: Can Dynamic Monopsony Provide an Explanation?|url=https://www.jstor.org/stable/2663717|journal=Oxford Economic Papers|volume=48|issue=3|pages=433–455|doi=10.1093/oxfordjournals.oep.a028577|jstor=2663717|issn=0030-7653}}</ref> These results are often explained as being the result of cross-industry competition. For example, if there were only one fast food producer, that industry would be very consolidated. The company, however, would be unable to drive down wages via monopsonistic power if it were also competing against retail stores, construction, and other jobs utilizing the same labour skill set. This finding is both intuitive (low-skilled labour can move more fluidly through different industries) and supported by a study of American labor markets which found monopsony effects were limited to professional sports, teaching, and nursing, fields where skill sets limit moving to comparably paid other industries.<ref name="auto1"/>

However, monopsony power might also be due to circumstances affecting entry of workers on the supply side (like in the referenced case above), directly reducing the elasticity of labour supply to firms. Paramount among these are industry accreditation or licensing fees, regulatory constraints, training or education requirements, and the institutional factors that limit labour mobility between firms, including job protection legislation.

An alternative that has been suggested as a source of monopsony power is worker preferences over job characteristics.<ref name="ECJ">{{cite journal | title=Minimum Wages for Ronald McDonald Monopsonies: a Theory of Monopsonistic Competition | last1=Bhaskar |first1=V. |last2=To |first2=Ted | journal=The Economic Journal | year=2001 | volume=109 | issue=455 | pages=190–203 | doi=10.1111/1468-0297.00427|citeseerx = 10.1.1.195.6646}}</ref><ref name="jep 2">{{cite journal | title=Oligopsony and Monopsonistic Competition in Labor Markets |first1=V. |last1=Bhaskar |first2=Alan |last2=Manning |first3=Ted |last3=To | journal=Journal of Economic Perspectives | year=2002 | volume=16 | issue=2 | pages=155–274 | doi=10.1257/0895330027300| url=http://discovery.ucl.ac.uk/15468/1/15468.pdf | doi-access=free }}</ref> Such job characteristics can include distance from work, type of work, location, the social environment at work, etc. If different workers have different preferences, employers could have local monopsony power over workers that strongly prefer working for them.

Empirical evidence of monopsony power has been relatively limited. In line with the considerations discussed above, but perhaps counter to common intuition, there is no observable monopsony power in low-skilled labour markets in the US.<ref name="auto1"/>  Though there has been at least one study finding monopsony power in Indonesia due to barriers to entry in developing countries.<ref name="CU">{{cite journal | url=http://conference.iza.org/conference_files/worldb2011/brummund_p6819.pdf | title=Evidence of Monopsony in the Labor Market of a Developing Country | last=Brummond |first=Peter | journal=Cornell University | year=2010 | url-status=live | archive-url=https://web.archive.org/web/20180405025127/http://conference.iza.org/conference_files/worldb2011/brummund_p6819.pdf | archive-date=2018-04-05 }}</ref> Several studies expanding their view for monopsony power have found economic and labor mobility in the US precludes any detectable monopsony effects<ref name="ILRR">{{cite journal | url=https://www.researchgate.net/publication/246546086 | title=Monopsony Power, Pay Structure and Training | first1=Samuel |last1=Muehlemann |first2=Paul |last2=Ryan |first3=Stefan C. |last3=Wolter | journal=Industrial and Labor Relations Review | year=2013 | volume=66 | issue=5 | pages=1097–1114 | doi=10.1177/001979391306600504 | url-status=live | archive-url=https://web.archive.org/web/20180405024251/https://www.researchgate.net/publication/246546086_Monopsony_Power_Pay_Structure_and_Training | archive-date=2018-04-05 | hdl=10419/51865 | s2cid=56051639 | hdl-access=free }}</ref> with the notable exceptions of professional sports<ref name="auto1"/> and (with some disagreement<ref name="JLE">{{cite journal | url=http://www.dartmouth.edu/~dstaiger/Papers/2010/staiger%20spetz%20phibbs%20monopsony%20jole%202010.pdf | title=Is There Monopsony in the Labor Market? Evidence from a Natural Experiment | first1=Douglas O. |last1=Staiger |first2=Joanne |last2=Spetz |first3=Ciaran S. |last3=Phibbs | journal=Journal of Labor Economics | year=2010 | volume=28 | issue=2 | pages=211–236 | doi=10.1086/652734 | url-status=live | archive-url=https://web.archive.org/web/20170809040652/http://www.dartmouth.edu/~dstaiger/Papers/2010/staiger%20spetz%20phibbs%20monopsony%20jole%202010.pdf | archive-date=2017-08-09 | citeseerx=10.1.1.713.2114 | s2cid=1920482 }}</ref>) nursing.<ref name="JHE">{{cite journal | url=https://www.angelfire.com/wizard/moti_gross/dl_files/labor/nurses.pdf | title=Monopsony Power and Relative Wages in the Labor Market for Nurses | first1=Barry |last1=Hirsch |first2=Edward J. |last2=Schumacher | journal=Journal of Health Economics | year=1995 | volume=14 | issue=4 | pages=443–476 | doi=10.1016/0167-6296(95)00013-8 | pmid=10153250 | url-status=live | archive-url=https://web.archive.org/web/20170810190515/http://www.angelfire.com/wizard/moti_gross/dl_files/labor/nurses.pdf | archive-date=2017-08-10 }}</ref><ref name="HCAFR">{{cite journal | url=https://digitalcommons.trinity.edu/cgi/viewcontent.cgi?article=1011&amp;context=hca_faculty | title=Classic or New Monopsony? Searching for Evidence in Nursing Labor Markets | first1=Barry T. |last1=Hirsch |first2=Edward J. |last2=Schumacher | journal=Health Care Administration Faculty Research | year=2005 | volume=24 | issue=5 | pages=969–989 | doi=10.1016/j.jhealeco.2005.03.006 | pmid=16005089 | url-status=live | archive-url=https://web.archive.org/web/20150910141123/http://digitalcommons.trinity.edu/cgi/viewcontent.cgi?article=1011&context=hca_faculty | archive-date=2015-09-10 }}</ref> Both of these industries have highly specialized labor conditions and are generally not substitutable. According to a 2020 review of the existing literature on monopsony in labor markets, there is some evidence of monopsony power in higher income industries due to contractual limitations (non-competes for example) though the author notes that the large majority of economists do not ascribe notable monopsony effects to labor markets.<ref>{{Cite journal|last=Manning|first=Alan|date=2020-06-01|title=Monopsony in Labor Markets: A Review|url=http://eprints.lse.ac.uk/103482/1/MonopsonyILR_Revision.pdf|journal=ILR Review|volume=74|language=en-US|pages=3–26|doi=10.1177/0019793920922499|s2cid=213995471|issn=0019-7939}}</ref>

== See also ==

* [[Bilateral monopoly]]
* [[Canadian Wheat Board]]
* [[Captive supply]]
* [[Conflict theories]]
* [[Single-payer health care]]
* [[Single desk]]

==Notes==
{{notelist}}

==References==
{{Reflist|2}}

==Further reading==
* {{cite journal
 | doi = 10.2307/1926970
 | last1 = Atkinson | first1 = S.E. | first2 =  J. | last2 = Kerkvliet
 | year = 1989 | volume = 71 | issue =  2  | pages = 250–257
 | title = Dual Measures of Monopoly and Monopsony Power: An Application to Regulated Electric Utilities
 | journal = The Review of Economics and Statistics
 | jstor = 1926970
}}
* {{cite journal
 | doi = 10.1111/1468-0297.00427
 | last1 = Bhaskar | first1 =  V. | first2 = T. | last2 = To
 | year = 1999  | journal =  The Economic Journal | volume = 109 | pages = 190–203
 | title = Minimum Wages for Ronald McDonald Monopsonies: A Theory of Monopsonistic Competition
 | issue = 455
| citeseerx = 10.1.1.195.6646 }}
* {{cite journal
 | doi = 10.1257/0895330027300
 | last1 = Bhaskar | first1 =  V. | first2 = A. | last2 =  Manning  | first3 = T. | last3 = To
 | year = 2002 | volume = 16 | pages =  155–174
 | title = Oligopsony and Monopsonistic Competition in Labor Markets
 | journal = Journal of Economic Perspectives
 | issue = 2
 | doi-access = free}}
* {{cite journal
 | last1 = Boal | first1 = W.M.
 | year = 1995  | volume = 26 | issue = 3 | pages = 519–536
 | title = Testing for Employer Monopsony in Turn-of-the-Century Coal Mining
 | journal = The RAND Journal of Economics
 | doi = 10.1017/S002205070004119X
 | jstor = 2556001
| s2cid = 153960375 }}
* {{cite journal
 | last1 = Boal | first1 = W.M.  | first2 =  M.R. | last2 = Ransom
 | year  = 1997  | volume = 35 | issue =  1 | pages = 86–112
 | title = Monopsony in the Labor Market
 | journal = Journal of Economic Literature
}}
* {{cite journal
 | doi = 10.2307/3003381
 | last1 = Just  | first1 =  R.E. | first2 =  W.S. | last2 = Chern
 | year  = 1980
 | title = Tomatoes, Technology, and Oligopsony
 | journal = The Bell Journal of Economics | volume = 11 | issue =  2  | pages = 584–602
 | jstor = 3003381
| osti = 5651801 }}
* {{cite journal
 | doi = 10.2307/2109909
 | last1 = Murray | first1 =  B.C.
 | year  = 1995
 | title = Measuring Oligopsony Power with Shadow Prices: U.S. Markets for Pulpwood and Sawlogs
 | journal = The Review of Economics and Statistics | volume = 77 | issue =  3 | pages = 486–498
 | jstor = 2109909
}}
* {{cite book
 | last1 = Robinson | first1 =  J.
 | year  = 1933
 | title = The Economics of Imperfect Competition London: Macmillan
| url = https://archive.org/details/economicsofimper0000robi_u6j3 | url-access = registration }}
* {{cite journal
 | doi = 10.1086/260309
 | last1 = Rodriguez | first1 =  C.A.
 | year  = 1975
 | title = Trade in Technological Knowledge and the National Advantage
 | journal = The Journal of Political Economy | volume = 83 | issue =  1 | pages = 121–136
| s2cid = 155075199 }}
* {{cite journal
 | doi = 10.2307/1928165
 | last1 = Schroeter | first1 =  J.R.
 | year  = 1988
 | title = Estimating the Degree of Market Power in the Beef Packing Industry
 | journal = The Review of Economics and Statistics | volume = 70 | issue =  1 | pages = 158–162
 | jstor = 1928165
| url = http://lib.dr.iastate.edu/econ_las_pubs/84 }}
*[[Suresh Naidu]] and Eric A. Posner. 2021. "[http://jhr.uwpress.org/content/early/2021/06/02/jhr.monopsony.0219-10030R1.abstract Labor Monopsony and the Limits of the Law.]" ''Journal of Human Resources''

==External links==
{{Wiktionary}}

*{{cite web
 | url = http://eh.net/encyclopedia/article/boal.monopsony
 | title = Monopsony in American Labor Markets
 | access-date = 2005-12-12
 | archive-url = https://web.archive.org/web/20060113102729/http://www.eh.net/encyclopedia/article/boal.monopsony
 | archive-date = 2006-01-13
 | url-status = dead
 }}

{{microeconomics}}
{{Authority control}}

[[Category:Monopsonies|*]]
[[Category:Market failure]]
[[Category:Monopoly (economics)]]