Are Unrealistic Assumptions/Simplifications Acceptable? Some Methodological Issues in Economics

Are unrealistic assumptions acceptable? If results are not changed in a misleading way, they are acceptable. The same assumption may be acceptable in one context and not in another. Assuming identical pairs of individuals in the parity and limit theorems in general equilibrium theory is acceptable as results are not changed substantially. The alleged equivalence of the first‐price and second‐price auctions is based on misleading assumptions; Coase's case against taxing pollution is based on a misleading all‐or‐nothing comparison. The contrasting results (neutrality versus non‐neutrality of money) of perfect versus imperfect competition in macroeconomics with important real‐world policy relevance are also used to illustrate the point.     

On a general periodic preventive maintenance policy incorporating warranty contracts and system ageing losses

In this paper, a general periodic preventive maintenance (PM) policy for a repairable revenue-generating system is developed and studied. We define ‘ageing losses’ as the difference in revenues generated by an ideal system (no ageing) and a real system that ages over the same period of consideration. It is assumed that preventive maintenance slows the system deterioration process and therefore reduces ageing losses. The proposed model is general in the sense that (1) both the warranty contracts and system ageing losses are incorporated in the maintenance cost modeling and (2) the implementation of PM actions does not have to be strictly periodic. A cost model is developed for the buyer under two decision variables—the calendar time of the first PM and the degree of each PM. Numerical examples are then presented to show the effectiveness of the proposed model. Sensitivity analyses are further conducted to investigate the impact of model parameters on optimal solutions.     

We are more tolerant than I: self-construal and consumer responses toward deceptive advertising

Marketing Letters - Deceptive advertising, or advertising that intends to mislead consumers by false claims or incomplete disclosure, is ubiquitous in the marketplace. Though prior research has...     

The Incidence of Public Spending on Healthcare: Comparative Evidence from Asia

The article compares the incidence of public healthcare across11 Asian countries and provinces, testing the dominance of healthcareconcentration curves against an equal distribution and Lorenzcurves and across countries. The analysis reveals that the distributionof public healthcare is prorich in most developing countries.That distribution is avoidable, but a propoor incidence is easierto realize at higher national incomes. The experiences of Malaysia,Sri Lanka, and Thailand suggest that increasing the incidenceof propoor healthcare requires limiting the use of user fees,or protecting the poor effectively from them, and building awide network of health facilities. Economic growth may not onlyrelax the government budget constraint on propoor policies butalso increase propoor incidence indirectly by raising richerindividuals' demand for private sector alternatives.     

Food price increases and net food importing countries: lessons from the recent past

Recent increases in food and other commodity prices have highlighted concerns that many poor countries are net food importers and higher food prices would worsen their trade balances. In this article, we analyze the changes in food trade balances associated with the 32% increase in food prices from 2000/2001 to 2004/2005. We find a small deterioration in food trade balances of low‐income countries and an improvement in middle‐income countries. The deterioration is most severe for countries in conflict and small island states, so attention should be placed first on these countries and on a few very‐low‐income countries that are also vulnerable. Because low‐income countries as a group had much lower agricultural GDP growth rates than middle‐income countries, the answers to food vulnerability in low‐income countries should probably be addressed within the context of incentives for agricultural production.     

Media Coverage and the Stock Market Valuation of TARP Participating Banks‡

We examine the impact of media coverage of the Capital Purchase Program (CPP) under the Troubled Assets Relief Program on the equity market valuation of participating bank holding companies (CPP banks). We document substantial negative coverage of the CPP and its participants over the five quarters following the program's initiation. We find that the extent of negative media coverage about the CPP exerted substantial downward pressure on the stock returns of CPP banks, decreasing their valuation relative to bank holding companies not participating in the program. We show that our findings cannot be explained by differences in the banks’ financial viability at the CPP's initiation, new information about their performance being released to the market after the CPP's initiation or preceding stock returns causing the negative media coverage. Our findings highlight the importance of investor sentiment, as reflected by the tone of media coverage, in banks’ valuation during a period of high uncertainty in financial markets.