This paper studies the effects of seller concentration and static market power on tacit collusion in extensively repeated laboratory posted-offer markets. Contrary to the implications of some earlier research, we find that tacit collusion does not become pervasive with extensive repetition. In a ‘strong no power’ design persistently competitive outcomes are observed in markets with three or fou...

This paper discusses the assessment and visualization of market power in bulk electricity markets, with the explicit consideration of transmission system constraints. In general, market power is the ability of a particular seller or group of sellers to maintain prices profitably above competitive levels for a significant period of time. When an entity has and exercises market power, it ceases t...

This paper quantifies the degree of market power in the German wholesale electricity market. A fundamental model is used to derive competitive marginal cost estimators which are compared with observed electricity prices. Marginal costs are calculated focusing on market fundamentals such as plant capacities, fuel prices, and load structures. In addition, international power exchange and dynamic ...

Market power refers to conditions where the providers of a service can consistently charge prices above those that would be established by a competitive market. There are many well known definitions of market power, including indices intended to quantify the degree of market concentration of energy supplies. This paper explores a method by which one of the standard indices in market power analy...

I present a model where firms and workers set wages above the market-clearing level. Unemployment is thus generated by their exercise of market power. Because both the labor and product markets are imperfectly competitive, market power in the labor market interacts with market power in the product market. This interaction sheds new light on the effects of policy interventions on unemployment an...

Despite the robust tendency of laboratory markets to generate competitive outcomes, some market designs deviate persistently from competitive predictions. This essay discusses the primary drivers of supra-competitive prices that have been observed in market experiments. Trading Institutions and Market Performance. The robustness of competitive market predictions stands as one of the most impres...

Niagara Mohawk's PowerChoice proposal has a central goal of creating competitive markets for electric power in the near term. PowerChoice would create an Independent System Operator (ISO) to manage load and, in addition, a competitive wholesale generation market in the form of a Power Exchange. The Power Exchange would operate in a manner similar to financial markets found around the world. By ...

Panzar and Rosse tests for market structure, utilizing analysis of reduced form revenue equations, indicate that the trucking industry is not in long-run perfectly competitive equilibrium. However, it is ambiguous whether this is due to competitive disequilibrium or the existence of market power.

E®ective competition in wholesale electricity markets is a necessary feature of a successful electricity supply industry restructuring. We examine the degree of competition in the California wholesale electricity market during the period June 1998 to September 1999 by comparing the market prices with estimates of the prices that would have resulted if owners of instate fossil fuel generating fa...