This letter explores the robustness (in an approximating sense) of a class of demand systems which have been discussed by Gorman. This class is of fundamental interest because it is known to be the only class of demand systems which permits exact aggregation. We discuss the reasons which...

This letter explores some global properties of the Gorman class of demand functions. We find that generalizing the homothetic preferences case to non-homotheticity gives rise to an unexpected global problem. In particular, interaction of the bounded budget share condition with either Slutsky...

We address two problems in this paper: i) What restrictions, if any, need to be imposed on the vector of aggregates in order that the aggregate demand functional form representation be nontrivial, economically interesting and have the generalized Gorman form as its only solution. ii) What...

In this paper we explore the following fundamental question: Are there reasonable conditions under which the parameters of estimated aggregate demand systems will uniquely identify underlying individual demand systems? In the process of examining this question we show that the conditions which...

For 5,500 individual online investors we match survey records with recent trading data to investigate what they want, in terms of their stated objectives for investing, what they do, in terms of the broad investing strategies they employ, and how their portfolios perform in terms of risk,...

The root cause of the financial crisis that erupted in 2008 is psychological. In the events which led up to the crisis, heuristics, biases, and framing effects strongly influenced the judgments and decisions of financial firms, rating agencies, elected officials, government regulators, and...

We are in the midst of what might end up as the most significant change to financial regulations since the Great Depression. This is because the financial and economic crisis that continues to engulf us is the most severe crisis since the Great Depression. The markets for houses, mortgages, and...

This paper examines the empirical relation among trading volume, informational variables (i.e., precision and differential beliefs), the bid-ask spread components, and price volatility using a structural model that treats the spread components, trading volume, and price volatility as endogenous....

The paper analyzes the manner in which sentiment affects the pricing kernel. Sentiment is another term for traders' errors. There are two main questions addressed in the paper. The central question is: How can the concept of sentiment be formally defined so as to identify the manner in which...

Behavioral finance endeavors to bridge the gap between neoclassical finance and cognitive psychology. Now an established field, behavioral finance looks at the investors' decision making formula as well as at their behavior, which in turn sheds light on the observed departures from the...