Matched Charitable Contributions: Comparative Statics and Equilibrium

Comparative statics in Cournot free entry equilibrium

In this paper we study the effects of a change in an exogenous variable (the fixed cost or a parameter in the demand function) on the output and the number of active firms in a Symmetric Cournot Equilibrium with Free Entry (SCEFE). The results obtained here are different from those obtained in the Cournot model with a given number of firms. In particular, an increase in demand might yield a dec...

Charitable Contributions: An Experimental Study

I run a series of laboratory experiments to estimate and describe the extent to which an individual's charitable donation to one cause displaces his or her giving to another cause. The experiments also investigate motivations for giving, including the simple warm-glow and public-goods models, and the desire for in uence, reputation, and normalizing behavior. In the rst wave of experiments I all...

Robust Comparative Statics

Comparative Statics, Stability, and Uniqueness

Consider an economic model whose equilibrium can be represented as the …xed point of a system of di¤erentiable equations. Using the theory ofB matrices, I show that comparative statics are well-behaved if the interactions between the equations are not too large, and the negative interactions are not too varied. When there are only positive interactions, for example when strategic complements pr...

Ratio Orderings and Comparative Statics

Monotone ratio orderings are refinements of first order stochastic dominance that allow monotone comparative statics results in games of incomplete information. We develop analogous refinements for second order stochastic dominance based on the monotonicity of the cumulative probability ratio and the unimodality of the likelihood and probability ratios. We go on to investigate comparative stati...