The Law of Demand versus Diminishing Marginal Utility

Diminishing marginal utility (DMU) is neither necessary nor sufficient for downward-sloping demand. Yet, upper-division undergraduate and beginning graduate students often presume otherwise. This paper provides two simple counter-examples that can be used to help students understand that the Law of Demand does not depend on DMU. The examples are accompanied with the geometry and basic mathematics of the utility functions and the implied ordinary/Marshallian demands.     

Encouraging Tutorial Attendance at University Did Not Improve Performance

When tertiary education is subsidised the cost of poor student performance in university subjects falls not only on the individual student but also on society in general. Society therefore has an interest in promoting student performance. There is evidence in the literature that absenteeism from university classes is widespread and that absenteeism adversely affects student performance. In this paper I describe an incentive scheme that increased attendance of business and economics students in an introductory statistics subject at a typical Australian university. Like other authors I find a strong positive association between attendance and academic performance, both in the presence and absence of the scheme. However, there is no evidence that the incentive scheme caused student performance to improve. Although students attended more classes they did not perform better than students in the previous year's class who had the same observable characteristics and attendance levels but who were not exposed to the scheme.     

Race and employment dislocation in California’s aerospace industry

This article finds that African American and Latino workers have borne a disproportionate share of employment costs associated with defense cuts in California’s aerospace industry. The data for this analysis come from administrative files, which contain demographic and employment-related information for everyone who collects unemployment-insurance benefits. The analysis shows that African Americans suffered higher displacement rates, longer unemployment spells, and poorer outcomes in new jobs than whites. Latinos were disadvantaged in several ways, but not consistently in all categories. Asian Americans, on the other hand, generally fared better than whites. These results show that economic dislocation, in the form of defense cuts, reinforces racial inequality in the labor market.