An Equilibrium Selection Theory of Monopolization

We develop a duopoly model in which firms compete for the market (e.g., investing in process innovation or product development) as well as in the market (e.g., setting quantities or prices). Competition for the market generates multiple equilibria that differ in the firms’ investment levels, relative size, and profitability. We show that monopolization that affects competition in the market can act as an equilibrium selection device in competition for the market. In particular, it eliminates equilibria that are undesirable for the monopolizing firm, while not generating new equilibria. This result complicates the task of determining whether a firm's dominance in a given market is the result of fair competition or unlawful monopolization. We discuss a number of implications for antitrust policy and litigation, and illustrate these by means of two well‐known antitrust cases.     

Quality and capacity choices in a vertical differentiation model with congestion

We consider a vertically differentiated market in which consumers’ utility is assumed to depend on the price, congestion level and the stand‐alone quality of the good or service. Two firms compete on this market, choosing capacities, stand‐alone qualities and prices. We characterize completely the subgame perfect equilibrium for the homogenous market case (where only one firm is active without congestion). We prove that both firms are active, choosing minimal differentiation along the capacity and quality dimensions. Therefore, the presence of congestion rules out market preemption as a possible outcome in equilibrium and weakens the incentive to differentiate.     

Testing Oil Refiners' Conduct in Korea: A Differentiated Product Approach

This paper investigates oil refiners' conduct in the Korean gasoline market. Specifically, I examine which of two modes of conduct, Bertrand–Nash competition or collusion, better fits the data. Unlike previous literature, this paper employs a differentiated product approach to address the stylized discrepancy in refiners' brands' prices: stable stratification of prices among refiners, but an unlikely equilibrium outcome in the homogenous goods market. Correct understanding of refiners' conduct is important because appropriate policy responses to collusion differ significantly from appropriate responses to competition‐driven outcomes. The results of this paper support the hypothesis that Bertrand–Nash competition better explains refiners' conduct.     

Urbanization,inequality and property prices: Equilibrium pricing and transaction in the Chinese housing market

The particularly overheated Chinese housing market, with its soaring property prices, has attracted a large amount of research. We point out three of its striking empirical features, which current literature leaves unexplored: co-existence of steady growth of real transaction price and excess supply, accelerations in price-to-income ratio, and significantly strong positive correlation between real transaction prices and income inequality. A search-equilibrium model is built to explain these facts. Heterogeneous buyers and homogeneous sellers randomly search for partners to trade in a frictional property market. The search equilibrium of the property market is either a high-price-and-low-transaction elitist matching equilibrium, or a low-price-and-high-transaction pooled matching equilibrium. The terms of trade determine which equilibrium arises. Empirical observations argue for the development of China's property market through evolution from a pooled matching equilibrium to an elitist matching equilibrium. We set out to show that the market equilibrium is always inefficient, due to crowding out externalities and market incompleteness. Policy experiments support redistributive tax, as a means to improve social welfare.     

Libéralisation du commerce et intégration spatiale des marchés: Le cas du maïs au Togo

Abstract: The cereal market of Togo was liberalized in 1987. This policy aims to improve markets' spatial integration through the development of arbitrage. The paper assesses the extent of maize market spatial integration in order to understand how it has been affected by price liberalization. The monthly retail maize prices collected on 13 markets for the period from 1980 to 2001 are considered. The results show that the impact of price liberalization on markets integration is moderate. The liberalization has not significantly improved the extent of long‐run and short‐run integration of maize markets. The speed of price adjustment is relatively weak for most of the markets. In order to improve market efficiency, it is suggested that the government should create a market information service (SIM) which will be entrusted in collecting and disseminating weekly cereal prices all over the country.     

Costly Buyer Search in a Differentiated Products Model: An Experimental Study

This study examines whether the content of buyer information and the timing of its dissemination affects seller market power. We construct laboratory markets with differentiated goods and costly buyer search in which sellers simultaneously post prices. The experiment varies the information on price or product characteristics that buyers learn under different timing assumptions (pre‐ and postsearch), generating four information treatments. Theory predicts that price information lowers the equilibrium price, but information about product characteristics increases the equilibrium price. That is, contrary to intuition, the presence of informed buyers may impart a negative externality on other uninformed buyers. Data support the model's negative externality result when sellers face a large number of robot buyers that are programmed to search optimally. Observed prices conform to the model's comparative statics and are broadly consistent with predicted levels. With human buyers, however, excessive search instigates increased price competition, and sellers post prices that are significantly lower than predicted.     

How Do Retailers Price Beer During Periods of Peak Demand? Evidence from Game Weeks of the German Bundesliga

This article considers retail beer pricing during game weeks of the German Bundesliga. German consumers exhibit a high degree of brand‐loyalty in their preference for regionally crafted beers, and we exploit the regional brand‐loyalty of German beer consumers to identify brand‐level demand shocks for beers preferred by the home team's fans and visiting team's fans during Bundesliga game weeks. We find retailer price adjustments at the category level mask a considerably more nuanced pricing behavior at the brand level. Retailers in regions hosting Bundesliga games significantly increase beer prices at the category level during game weeks; however, at the brand level, we find retailers selectively discount prices on the home team's sponsored beers and systematically raise prices on the visiting team's sponsored beers. Our findings are consistent with a “tourist–natives” model of retail pricing during periods of increased demand in the German beer market.     

Climate change impacts on China's agriculture: The responses from market and trade

China's food security has been facing several challenges, which are likely to be worsened due to climate change. The purpose of this paper is to provide an evidence on the impacts of climate change on China's agriculture, with particular attention to the market and trade responses. Using projected crop yield changes for China and its' main trading partners under changing climate, we employ an agricultural partial equilibrium model (CAPSiM) and a linked national and global equilibrium model (CAPSiM-GTAP) to assess the impacts on food production, price, trade and self-sufficiency of China. Our results show that climate change will have significant effects on crop production though with large differences among crops. Under the worst climate change scenario RCP 8.5, wheat yield in China is projected to decline by 9.4% by 2050, which is the biggest yield reduction among the crops. However, the market can also respond to the climate change, as farmers can change inputs in response to reduced yields and rising prices. As a result, production losses for most crops are dampened. For example, wheat production loss under RCP8.5 reduces to only 4.3% due to market response. The adverse impacts on crop production will be further reduced after accounting for the trade response as farmers adjust production to much higher prices in the more severely affected countries. The paper concludes that we need to learn more from farmers who optimize their production decisions in response to the market and trade signals during climate change. A major policy implication is that policymakers need to mainstream the market and trade responses into national plans for climate adaptation.     

METROPOLITAN HOUSE PRICES IN SOUTH AFRICA: DO THEY CONVERGE?

The question this paper investigates is whether or not different metropolitan areas each constitute a separate housing market or whether or not there is a single South African housing market. Theory on the Law of One Price suggests that if products or geographic areas belong in the same market, their absolute prices must converge, so that their relative prices are stationary. By using cross-sectional time series data of five metropolitan areas, the paper tests for the Law of One Price by applying the Im, Pesaran and Shin panel unit root test. The paper finds strong evidence of convergence in large middle-segment house prices and weaker support for convergence in medium middle-segment house prices. In addition, the paper finds no evidence for convergence in small middle-segment house prices. This suggests the existence of a national market for large and possibly middle-segment houses in metropolitan areas, but separate metropolitan markets for small middle-segment houses. In addition, the paper estimates the speed of convergence and finds that large middle-segment house prices converge within two to seven quarters, while the speed of convergence for medium middle-segment house prices in three of the five areas is five to eight quarters.     

Examining the impact of home purchase restrictions on China's housing market

This paper studies the impact of home purchase restrictions on China's housing market. We estimate a structural model of household preference for housing, real estate developers' pricing decisions, and equilibrium market outcome in five large cities. By comparing the estimation results from pre- and post-policy intervention, we find that, after home purchase restrictions are implemented, overall housing demand in most cities becomes weaker and less price elastic; meanwhile, real estate developers face higher holding costs and thus are willing to lower prices and sell more quickly. Counterfactual analyses show that in some cities alternative policy designs that cause less structural change of demand could achieve larger consumer welfare and social welfare than the implemented policy.     

Competing with Costco and Sam's Club: Warehouse Club Entry and Grocery Prices

Prior research shows that grocery stores reduce prices to compete with Walmart Supercenters. This study finds evidence that the competitive effects of two other big‐box retailers—Costco and Walmart‐owned Sam's Club—are quite different. Using city‐level panel grocery price data matched with a unique data set on Walmart and warehouse club locations, we find that Costco entry is associated with higher grocery prices at incumbent retailers and that the effect is strongest in cities with small populations and high grocery store densities. This is consistent with incumbents competing with Costco along nonprice dimensions, such as product quality or quality of the shopping experience. We find no evidence that Sam's Club entry affects grocery stores' prices, consistent with Sam's Club's focus on small businesses instead of consumers.     

Information Conveyed in Announcements of Analyst Coverage*

This paper examines the security market response to the announcement of sell-side analysts' decisions to initiate coverage of a firm. We examine the market reaction to the initiation announcement and the accompanying investment recommendation, by disaggregating our sample based on existing analyst coverage at the announcement date. We find, on average, a significantly larger, positive stock price reaction to buy recommendations conveyed in announcements of coverage initiation for firms with a small existing analyst following compared to such announcements for firms receiving no prior analyst coverage. Tests show that the relation between the extent of preexisting analyst coverage and market response is nonlinear and concave down in shape. Specifically we find that lightly followed firms, on average, experience larger price reactions to announcements of coverage initiations than either previously uncovered firms or more heavily followed firms. We test for and find that this result holds over a range of definitions of light coverage and is not attributable to the presence of an underwriting relationship existing between the analyst's employer and the firm receiving coverage. We do find that initiations by analysts named to Institutional Investor magazine's “All-American Research Team” produce a significantly larger market reaction than do initiations by non-All-American security analysts. In addition, similar to the market response associated with other types of information events, we observe that proxies for the richness of the initiated firms' preannouncement information environment are associated with event-day average abnormal returns.     

The Discriminating Beta: Prices and Capacity with Correlated Demands

Uniform customer‐class pricing can do much of the work of congestion‐based or time‐of‐day pricing in communication or wireless networks. A monopolist exploits differences in the stochastic characteristics of demands. If demands are correlated and the firm faces a capacity constraint, then it can set prices to reduce the variability of aggregate demand, thereby reducing the probability of excess demand and the associated service quality deterioration. Demands that covary negatively with aggregate demand are valuable to the firm in much the same way that securities that covary negatively with the market are valuable in a stock portfolio. Customer classes that exhibit low covariance with aggregate demand realize lower optimal prices. Optimal capacity is also affected by these covariances. As long as demands are not perfectly positively correlated, expected costs of joint production are less than expected costs of serving demands separately.     

The effect of universal pre-kindergarten policy on female labor force participation—A synthetic control approach

This paper examines the effect of universal pre-kindergarten (pre-k) on the labor force participation of mothers with pre-k-aged children in Oklahoma and Georgia. I apply the synthetic control method (SCM) to Current Population Survey (CPS) data to identify the causal relationship between universal pre-k and female labor market outcomes. I find that the universal pre-k policy has a positive impact on the intensive margin of the labor supply of mothers with pre-k-aged children in Georgia, which provides full-day child care services for all pre-k programs. However, Oklahoma's universal pre-k policy has little effect on the labor outcomes of mothers with 4-year-old children. The empirical results also suggest that universal pre-k has heterogeneous impacts on subsamples stratified by education level, marital status, poverty status, and the age structure of children in the household.     

ASYMMETRIC PRICE TRANSMISSION AND MARKET CONCENTRATION: AN INVESTIGATION INTO FOUR SOUTH AFRICAN AGRO-FOOD INDUSTRIES

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