This paper calculates elasticities of demand for race groups in South Africa, government-revenue-maximizing tax rates, and excess burdens associated with taxes. A change in tax policy can be the political engine of income redistribution with appropriate taxes and subsidies on different commodities. This paper compares both semiparametric and parametric estimators with the censored least absolute deviation and censored maximum likelihood in calculating demand equations and elasticities. It is found that cigarettes and milk are the two commodities that generate the most government revenues from whites per unit of government revenues from blacks.

We survey the recent developments in the literature on corporate diversification. This literature is voluminous, diverse, and quite old. To make the task more manageable, we focus our attention on recent contributions to that subset of the diversification literature that is in our judgment most influential in setting the agenda for financial research. The study of diversification at the corporate level can be grouped into one of two bodies of literature: cross-sectional studies of the link between corporate diversification and firm value (i.e., the diversification discount) and longitudinal studies of patterns in corporate diversification through time. The prevailing wisdom among financial economists throughout much of the last decade has been that diversified firms sell at a discount and that the level of corporate diversification has been trending downward. However, recent research questions both these tenets and a number of studies now suggest that the diversification discount is either not due to diversification at all, or may be a result of improper measurement techniques. Furthermore, some researchers are now beginning to argue that previous attempts to assess changes in the levels of corporate diversification through time is also flawed as a result of biases built into the compustat database in combination with the use of noisy proxies for corporate diversification.

Economists have long emphasized the importance of expectations in determining macroeconomic outcomes. Yet there has been almost no recent effort to model actual empirical expectations data; instead, macroeconomists usually simply assume that expectations are "rational." This paper shows that while empirical household expectations are not rational in the usual sense, expectational dynamics are well captured by a model in which households' views derive from news reports of the views of professional forecasters, which in turn may be rational. The model's estimates imply that people only occasionally pay attention to news reports; this inattention generates "stickyness" in aggregate expectations, with important macroeconomic consequences.

In this paper we examine the role of social security in an economy populated by overlapping generations of individuals with time-inconsistent preferences who face mortality risk, individual income risk, and borrowing constraints. We find that unfunded social security lowers the capital stock, output, and consumption for consumers with time-consistent or time-inconsistent preferences. However, it may raise or lower welfare depending on the strength of time inconsistency.

This paper examines precautionary behavior by relating job-loss risk to household net worth. We use existing best practice and some new strategies to deal with some problematic issues inherent in this literature regarding proxying uncertainty, instrumentation, and incorporating theoretical restrictions. We do not find precautionary variation in the wealth holdings of households with low permanent income, but do find precautionary effects for moderate and higher-income households. When the dependent variable is total net worth, these findings are robust to several alternative specifications. But we do not find precautionary responses in subaggregates of wealth that exclude home equity.

In six experiments we show that initial valuations of familiar products and simple hedonic experiences are strongly inuenced by arbitrary “anchors ” (some-times derived from a person’s social security number). Because subsequent valua-tions are also coherent with respect to salient differences in perceived quality or quantity of these products and experiences, the entire pattern of valuations can easily create an illusion of order, as if it is being generated by stable underlying preferences. The experiments show that this combinationof coherent arbitrariness (1) cannot be interpreted as a rational response to information, (2) does not decrease as a result of experience with a good, (3) is not necessarily reduced by market forces, and (4) is not unique to cash prices. The results imply that demand curves estimated from market data need not reveal true consumer preferences, in any normatively signicant sense of the term. Economic theories of valuation generally assume that prices of commodities and assets are derived from underlying “funda-mental ” values. For example, in nance theory, asset prices are believed to reect the market estimate of the discounted present value of the asset’s payoff stream. In labor theory, the supply of labor is established by the trade-off between the desire for con-sumption and the displeasure of work. Finally, and most impor-tantly for this paper, consumer microeconomics assumes that the demand curves for consumer products—chocolates, CDs, movies, vacations, drugs, etc.—can be ultimately traced to the valuation of pleasures that consumers anticipate receiving from these products. Because it is difcult, as a rule, to measure fundamental values directly, empirical tests of economic theory typically ex-amine whether the effects of changes in circumstances on valua-tions are consistent with theoretical prediction—for example, whether labor supply responds appropriately to a change in the wage rate, whether (compensated) demand curves for commodi-

The probit is generally considered to be one of the easiest nonlinear maximum likelihood problems. Nonetheless, in the course of at-tempting to replicate G. S. Maddala’s (1992, pp. 335–38) probit example, Houston Stokes (2003) encountered great difficulty. Of the six coeffi-cients, five coefficients/standard errors he could duplicate, but the sixth was off by more than rounding error. So he tried another package. And another. And another.... Finally, five dif-ferent packages had declared convergence to five solutions that differed only in the sixth coefficient. Estimates of the sixth coefficient ranged from 4.4 to 8.1, and estimates on its standard error ranged from 46 to 114,550.

An Examination of the Influence of Theory and Individual Theorists on Empirical Research in Microeconomics by Pierre-André Chiappori and Steven D. Levitt. Published in volume 93, issue 2, pages 151-155 of American Economic Review, May 2003

Using microdata for 22 countries over the 198594 period, we find that more compressed male wage structures and lower female net supply are both associated with a lower gender pay gap, with an especially large effect for wage structures. Reduced-form specifications indicate that the extent of collective bargaining coverage is also significantly negatively related to the gender pay gap. Together, the wage compression and collective bargaining results suggest that the high wage floors that are associated with highly centralized, unionized wage setting raise women's relative pay, since women are at the bottom of the wage distribution in each country.