Definition
Information asymmetry refers to a situation where one party in a transaction possesses superior or more accurate information than the other, leading to imbalanced decision-making and potential market inefficiencies.
Commentary
Origin of the term
The term has its origin in the work of George Akerlof, who, in his seminal 1970 paper named ‘The Market for “Lemons”: Quality Uncertainty and the Market Mechanism’, conceptualised how markets fail when one party possesses superior information than the other, and how such a mismatch leads customers to make adverse selection or sub-optimal choices while engaging in transactions.1 The theory was subsequently developed by Michael Spence through signalling theory, which suggested that the better-informed party could take credible or costly actions to hint about its superior quality, and Joseph E. Stiglitz through screening theory, which entailed that the less-informed party could design choices in a way to induce the other to reveal its type.2
The trio was jointly awarded the Sveriges Riksbank Prize in Economic Sciences “for their analyses of markets with asymmetric information” in 2001.3
Information Asymmetry may arise across a wide range of sectors, including financial services, insurance, healthcare, automobiles, labour markets, credit markets, digital platforms, E-commerce, online advertising, artificial intelligence, telecommunications, consumer markets, etc.4
Operation in Practice
Akerlof explained the Information Asymmetry through the example of a used-car market, wherein the buyer could not easily distinguish between a good car and a defective car, whereas the seller possessed better information about the actual quality of the vehicle. Since this created a situation where both good cars and “lemons” might be sold at the same average price, it incentivised the owners of good cars to leave the market, leaving mostly poor-quality cars for sale, encouraging adverse selection and reduction in the overall size and efficiency of the market.
Relevance vis-a-vis Competition Law
The concept holds direct relevance to Competition Law as unequal access to information, especially one that is commercially valuable for the enterprise may distort competition in the market by capitalizing on relevant information regarding consumer behaviour and market trends, which the rivals do not have access to. This can amplify entry barriers for potential entrants. In digital markets, platform economies and AI-driven markets, where information asymmetry specifically translates into data asymmetry, this can be a graver concern considering the ‘Winner-takes-All’ dynamics of the digital markets and reinforced learning effects that may potentially cause consumer lock-in. However, it has also been argued that reducing information asymmetry may not benefit all market participants uniformly, and may, in certain cases, reduce the expected returns of long-term passive investors.5
The concept of Information Asymmetry is closely related and interwoven with other concepts such as, Adverse selection,6 Moral Hazard,7 Principal-Agent Problem,8 etc.
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George A Akerlof, 'The Market for "Lemons": Quality Uncertainty and the Market Mechanism' (1970) 84 QJE 488↩︎
Karl-Gustaf Löfgren, Torsten Persson and Jörgen W Weibull, 'Markets with Asymmetric Information: The Contributions of George Akerlof, Michael Spence and Joseph Stiglitz' (2002) 104 Scandinavian Journal of Economics 195↩︎
The Royal Swedish Academy of Sciences, 'The Prize in Economic Sciences 2001 — Press Release' (NobelPrize.org, 10 October 2001) <https://www.nobelprize.org/prizes/economic-sciences/2001/press-release/> accessed 13 August 2026↩︎
Giovanni Dell'Ariccia, 'Asymmetric Information and the Market Structure of the Banking Industry' (IMF Working Paper WP/98/92, June 1998)↩︎
Kevin S Haeberle, 'Information Asymmetry and the Protection of Ordinary Investors' (2019) 53 UC Davis Law Review 145↩︎
Tejvan Pettinger, 'Adverse Selection Explained' (Economics Help, 28 November 2018) <https://www.economicshelp.org/blog/glossary/adverse-selection/> accessed 11 August 2026↩︎
Daniel Sgroi, 'Week 9: Asymmetric Information and Moral Hazard' (Lecture Slides, EC202, University of Warwick)↩︎
Tejvan Pettinger, 'Principal-Agent Problem' (Economics Help, 25 April 2017) <https://www.economicshelp.org/blog/26604/economics/principal-agent-problem/> accessed 11 August 2026↩︎
