Edgeworth price cycle

An Edgeworth price cycle is cyclical pattern in prices characterized by an initial jump, which is then followed by a slower decline back towards the initial level. The term was introduced by Maskin and Tirole (1988)[1] in a theoretical setting featuring two firms bidding sequentially and where the winner captures the full market.

Phases of a price cycle

A price cycle has the following phases:

  • War of attrition: When the price is at marginal cost, the firms are engaged in a war of attrition where each firm hopes that the competitor will raise her price first ("relent").
  • Jump: When one firm relents, the other firm will then in the next period undercut, which is when the market price jumps. This first period is the most valuable to be the low-price firm, which is what causes firms to want to stay in the war of attrition to force the competitor to jump first.
  • Undercutting: then follows a sequence where the firms take turns at undercutting each other until the market arrives back in the war of attrition at the low price.

Discussion

It can be debated whether Edgeworth Cycles should be thought of as tacit collusion because it is a Markov Perfect equilibrium, but Maskin and Tirole write: "Thus our model can be viewed as a theory of tacit collusion." (p. 592).[1]

Edgeworth cycles have been reported in gasoline markets in many countries.[2] Because the cycles tend to occur frequently, weekly average prices found in government reports will generally mask the cycling. Wang (2012)[3] emphasizes the role of price commitment in facilitating price cycles: without price commitment, the dynamic game becomes one of simultaneous move and here, the cycles are no longer a Markov Perfect equilibrium but rely on, e.g., supergame arguments.

Edgeworth cycles are distinguished from both sticky pricing and cost-based pricing. Sticky prices are typically found in markets with less aggressive price competition, so there are fewer or no cycles. Purely cost-based pricing occurs when retailers mark up from wholesale costs, so costs follow wholesale variations closely.

Alternative models of price cycles

There is a separate literature, which has explored conditions under which price cycles like the ones observed gasoline markets and found that consumer search models can rationalize cycling under various conditions.[4][5][6] Here, the intuition is that there is a small subset of consumers that are not informed about prices and therefore will buy from a firm regardless of the price charged. Once prices get low enough, a firm may find it optimal to charge a high price and exploit this small loyal segment rather than trying to win the whole market.

See also

References
  1. Maskin, Eric; Tirole, Jean (1988). "A Theory of Dynamic Oligopoly, II: Price Competition, Kinked Demand Curves, and Edgeworth Cycles". Econometrica. 56 (3): 571–599. doi:10.2307/1911701. JSTOR 1911701.
  2. "Edgeworth price cycles : The New Palgrave Dictionary of Economics". www.dictionaryofeconomics.com. Retrieved 2018-01-02.
  3. Wang, Zhongmin (2009-12-01). "(Mixed) Strategy in Oligopoly Pricing: Evidence from Gasoline Price Cycles Before and Under a Timing Regulation". Journal of Political Economy. 117 (6): 987–1030. CiteSeerX 10.1.1.320.9839. doi:10.1086/649801. ISSN 0022-3808. S2CID 16651870.
  4. Fershtman, Chaim; Fishman, Arthur (1992). "Price Cycles and Booms: Dynamic Search Equilibrium". The American Economic Review. 82 (5): 1221–1233. JSTOR 2117475.
  5. Tappata, Mariano (2009-12-01). "Rockets and feathers: Understanding asymmetric pricing". The RAND Journal of Economics. 40 (4): 673–687. doi:10.1111/j.1756-2171.2009.00084.x. ISSN 1756-2171. S2CID 62833662.
  6. Lewis, Matthew S. (2011-06-01). "Asymmetric Price Adjustment and Consumer Search: An Examination of the Retail Gasoline Market". Journal of Economics & Management Strategy. 20 (2): 409–449. CiteSeerX 10.1.1.199.1790. doi:10.1111/j.1530-9134.2011.00293.x. ISSN 1530-9134. S2CID 154718287.
  • E., Maskin and Tirole, J., “A Theory of Dynamic Oligopoly II: Price Competition, Kinked Demand Curves and Edgeworth Cycles”, Econometrica 56, 1988.
  • Eckert, Andrew and West, Douglas S., "Retail Gasoline Price Cycles across Spatially Dispersed Gasoline Stations", Journal of Law and Economics, Vol. XLVII, No. 1, April 2004, p. 245
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