Perpetual youth and endogenous labor supply: A problem and a possible solution

In the “perpetual youth” overlapping-generations model of Blanchard and Yaari, if leisure is a “normal” good then some agents will have negative labor supply. We suggest a solution to this problem by using a modified version of Greenwood, Hercowitz and Huffman’s utility function. The modification incorporates real money balances, so that the model may be used to analyze monetary as well as fiscal policy. In a Walrasian version of the economy, we show that increased government debt and increased government spending raise the interest rate and lower output, while an open-market operation to increase the money supply lowers the interest rate and raises output.     

Selection dynamics and adaptive behavior without much information

This paper uses the experimental method to investigate behavior in a coordination game when the information available to subjects is limited to their feasible choices and their experienced payoffs. In the experiment subjects converge to an absorbing state at rates that are orders of magnitude faster than reinforcement learning algorithms, but slower than under complete information. This state is very close to a mutual best response outcome. All cohorts converged to the market statistic predicted by the interior equilibrium regardless of the information conditions or the stability conditions. Eric Battalio programmed the graphical user interface. The National Science Foundation and Texas Advanced Research Program provided financial support. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation or the Texas Advanced Research Program.     

Income and Price Elasticities of Demand in South Africa: An Application of the Linear Expenditure System

This paper investigates the expenditure patterns of South African households using detailed cross‐sectional expenditure and price data that varies across region and time. Linear expenditure system parameter estimates are used to calculate income and price elasticities for a number of product categories at different points of the income distribution. We find substantial variation in the price and income elasticities of demand for items across the income distribution, with the bottom quartile being extremely sensitive to increases in the price of food and clothing items, and the top quartile being as sensitive as households in developed countries.     

Is Africa integrating? Evidence from product markets

This paper presents a price-based assessment of product market integration in Africa using disaggregated retail prices for 91 products and 12 African cities from 1991 to 2008. We find evidence of substantial deviations from the law of one price ? product price differences between the cities averaged 76% over the period – a result that is consistent with the presence of large barriers to trade in the continent. Mean price differences across cities fell by close to a quarter over the period, but the decline was concentrated in the early 1990s with little progress subsequently, despite the regional trade policies implemented by the countries. Gravity-style estimates reveal that reductions in external tariffs and global trends towards price convergence in the early 1990s are the key contributors to the trend in price integration amongst the African cities.     

Strategic Similarity and Emergent Conventions: Evidence from Similar Stag Hunt Games

This paper reports evidence on the origin of convention in laboratory cohorts confronting similar but not identical strategic situations repeatedly. The experiment preserves the action space of the game, while randomly perturbing the payoffs and scrambling the action labels in an effort to blunt the salience of retrospective selection principles. Hence, the similarity between stage games is reduced to certain strategic details, like efficiency, security, and risk dominance. Nevertheless, we do observe conventions emerging in half of the laboratory cohorts. When a convention emerges subjects's behavior conforms to the selection principles of efficiency rather than security or risk dominance. Journal of Economic Literature Classification Numbers: C72, C78, C92, D83.     

The Effect of Information Systems on Honesty in Managerial Reporting: A Behavioral Perspective*

This study examines the behavioral impact of an information system, and how that impact varies with the information system's precision, in an internal reporting environment. We propose that a manager's reporting decisions are affected by his or her trade‐off of the benefits of appearing honest against the benefits of misrepresentation. The information system affects the manager's trade‐off by improving the owner's ability to make an inference regarding the manager's level of honesty. Thus, to the extent that the manager perceives benefits to appearing honest, the presence of an information system can increase managerial honesty. As the information system becomes more precise, however, the manager must forgo greater benefits of misrepresentation in order to achieve the same appearance of honesty. For managers under a precise system, this will shift the trade‐off decision toward the benefits of misrepresentation and away from the benefits of appearing honest. Notably, in our experiment, the only benefit of appearing honest is an intrinsically motivated desire for social approval. We find that, although the existence of an information system increases managerial honesty, honesty is lower under a precise than under a coarse information system. We also compare profit earned by the owners in our experiment, which relies on a behavioral role of an information system, with the maximum profit theoretically possible given a contractual use of the information system. This comparison suggests that, unless the available information system is sufficiently precise, the owner will obtain greater profits by not contracting on its output, even if that output is fully contractible.     

South African Exporters and the Global Crisis: Intensive Margin Shock,Extensive Margin Hangover

This paper examines how changes at the intensive (established exporters exporting existing products to established markets) and the extensive (new exporters, products or markets) margins contribute to South African export growth and how this was affected by the global financial crisis. We find that the intensive margin is the more important contributor to export growth, contributing more than three quarters of observed growth. The intensive margin contracted significantly during the global financial crisis of 2009 but bounced back to pre‐crisis levels quickly. However, the impacts on the extensive margin persisted after the crisis with lower levels of entry of firms, new products and new destinations. The short‐term impact of the crisis was mitigated by the concentration of South African exports among larger, more productive super‐exporters. However, the fall in entry of new firms, products and destinations as a result of the crisis may mean that this concentration persists, and, at least over the next few years, South Africa does not diversify and broaden its exports.