Thomas P. Tangerås

Market power in the Nordic electricity wholesale market: A survey of the empirical evidence

We review the recent empirical research assessing market power on the Nordic wholesale market for electricity, Nord Pool. The studies find no evidence of systematic exploitation of system level market power on Nord Pool. Local market power arising from transmission constraints seems to be more problematic in some price areas across the Nordic countries. Market power can manifest itself in a number of ways that have so far escaped empirical scrutiny. We discuss investment incentives, vertical integration and buyer power, as well as withholding of base-load (nuclear) capacity.

Unilingual Versus Bilingual Education System: A Political Economy Analysis

We consider an economy with two language groups, where only agents who share a language can produce together. Schooling enhances the productivity of students and may modify their language endowment. Under a unilingual system, the language of the politically dominant group is the only language of instruction, and the members of the politically dominated group who attend school shift language. Instead, under a bilingual system, the members of the dominated group who attend school become bilingual. The dominant group chooses the education system, and then individuals decide whether to attend school. While agents do not get utility from speaking their own language, we show that a language conflict of the expected type endogenously arises in the choice between a unilingual and a bilingual system. Democracy (majority rule) always leads to the implementation of the socially optimal education system, while the unilingual system is too often implemented under minority rule. In the presence of productivity spillovers, there may be unanimity for unilingualism, even if this system is assumed to be technologically inferior. The model is consistent with evidence from Finland in 1919 and France in 1863, showing that the choice of bilingualism in education may not be related to the size of language groups.

Ethnic Diversity, Civil War and Redistribution

In a game-theoretic framework, we analyse the circumstances under which self-enforcing redistribution and power-sharing coalitions can be used to peacefully resolve ethnic conflict. The existence of a pacific equilibrium depends crucially on ethnic diversity (the number of ethnic groups). The risk of civil war is comparatively high at intermediate levels of ethnic diversity. The risk is low if a society is either very homogeneous or very diverse. Predictions of the model are consistent with evidence on the incidence of civil war.

Yardstick Competition and Quality

This paper explores the consequences for quality of introducing yardstick competition in duopoly when a verifiable quality indicator is available. Yardstick competition can be implemented by a menu of transfers that are linear in the cost differential between the two firms and in quality. Cost- and quality incentives are stronger in larger firms when improvements are highly valued by consumers and firms can significantly influence quality. Expenditures on quality improvement can increase or decrease following the introduction of yardstick competition. The crucial factor is the likelihood ratio of productivity between the two firms, not productivity differences.

A reexamination of renewable electricity policy in Sweden

Green certificates are the main instrument for promoting renewable electricity (RES-E) in Sweden. But certificates cover only a limited share of total RES-E production. Under partial coverage, crowding out may arise whereby costly new RES-E replaces inexpensive old RES-E. Granting certificates to all of RES-E production improves efficiency, but leaves windfall rent to otherwise profitable facilities. We also analyze transaction costs in the permit process for new RES-E in Sweden. Municipalities veto socially desirable projects because of asymmetrically distributed investment costs and benefits. We propose market-based permit fees rather than limited veto rights as a solution to this NIMBY problem.

Competition vs. Regulation in Mobile Telecommunications

This paper questions whether competition can replace sector-specific regulation of mobile telecommunications. We show that the monopolistic outcome may prevail independently of market concentration when access prices are determined in bilateral negotiations. A lighthanded regulatory policy can induce effective competition. Call prices are close to the marginal cost if the networks are sufficiently close substitutes. Neither demand nor cost information is required. A unique and symmetric call price equilibrium exists under symmetric access prices, provided that call demand is sufficiently inelastic. Existence encompasses the case of many networks and high network substitutability.

Optimal Transmission Regulation in an Integrated Energy Market

The capacity of the transmission network determines the extent of integration of a multi-national energy market. Cross-border externalities render coordination of network capacity valuable. Is it then optimal to collect regulatory powers in the hands of a single regulator? Should a common system operator manage the entire network? I show that optimal network governance depends on (i) whether the centralized regulatory agency is able to balance the interests of the different countries; (ii) asymmetries across countries in the gains from market integration; (iii) network characteristics (substitutability versus complementarity); and (iv) the social cost of operator rent.

From rent seeking to human capital: a model where resource shocks cause transitions from stagnation to growth

We present a growth model where agents divide time between rent seeking in the form of resource competition and working in a human capital sector. The latter is interpreted as trade or manufacturing. Rent seeking exerts negative externalities on the productivity of human capital. Adding shocks, in the form of fluctuations in the size of the contested resource, the model can replicate a long phase with stagnant incomes and high levels of rent seeking, interrupted by small, failed growth spurts, eventually followed by a permanent transition to a sustained growth path where rent seeking vanishes in the limit. The model also generates a rise and fall of the so-called natural resource curse: before the takeoff, an increase in the size of the contested resource has a positive effect on incomes; shortly after the takeoff, the effect is negative; and on the balanced growth path the growth rate of per capita income is independent of resource shocks.

Renewable Electricity Policy and Market Integration

I analyze renewable electricity policy in a multinational electricity market with transmission investment. If national policy makers choose support schemes to maximize domestic welfare, then a trade policy motive arises operating independently of any direct benefit of renewable electricity. The model predicts electricity importing (exporting) countries to choose policies which reduce (increase) electricity prices. A narrow pursuit of domestic objectives distorts transmission investment, thereby market integration, below the efficient level. Distortions cannot be corrected by imposing national renewable targets alone. Instead, subsidies to transmission investment and a harmonization of and reduction in the number of policy instruments can improve welfare.

Intense Network Competition

First, we demonstrate how unregulated price setting in mobile telecommunications may lead to monopolization, even when networks are highly substitutable. Second, we demonstrate that a menu of structural rules, including (i) mandatory interconnection, (ii) reciprocal access prices and (iii) a ban on price discrimination of calls to other networks, may restore competition. This regulation requires neither demand data nor information about call costs.