We develop a dynamic model of monopolistic competition which sheds light on how the interplay between the degree of product differentiation and intertemporal elasticity of substitution affects the steady-state equilibrium. Consumers love variety and split their labor endowment between wage...

We generalize the normalized Constant Elasticity of Substitution (CES) production function by allowing the elasticity of substitution to vary isoelastically with (i) relative factor shares, (ii) marginal rates of substitution, (iii) capital-labor ratios, or (iv) capital-output ratios. Ensuing...

This paper estimates the elasticity of substitution between capital and skill using variation across U.S. counties in immigration-induced skill-mix changes between 1860 and 1930. We find that capital began as a q-complement for skilled and unskilled workers, and then dramatically increased its...

We estimate the sensitivity of Internet retail purchasing to sales taxes using data from the eBay marketplace. Our first approach exploits the fact that seller locations are revealed only after buyers have expressed interest in an item by clicking on its listing. We use millions of location...

This paper estimates the elasticity of substitution between capital and skill using variation across U.S. counties in immigration-induced skill mix changes between 1860 and 1930. We find that capital began as a q-complement for skilled and unskilled workers, and then dramatically increased its...

We document a change in household shopping behavior during the Great Recession. Households purchased more on sale, larger sizes and generic products, increased coupon usage, and shopping at discount stores. We estimate that the returns to these shopping activities declined during the recession...

As shown in the 1930s by Hicks and Robinson the elasticity of substitution (`sigma`) is a key parameter that captures whether capital and labor are gross complements or substitutes. Establishing the magnitude of `sigma` is vital, not only for explaining changes in the distribution of income...

This article considers an economy whose production function takes both renewable and non-renewable resources as inputs. We extend the current literature by allowing for exogenous technical change in the elasticity of substitution between these two types of resources. In addition, we study the...

Using novel firm-level microdata and leveraging a natural experiment, this paper provides causal evidence for the role of trade and multinational firms in the cross-country transmission of shocks. Foreign multinational affiliates in the U.S. exhibit substantial intermediate input linkages with...

Both horizontal and vertical innovations are studied in this paper, using monopolistic and oligopolistic competition models with multiproduct firms. We consider a two-stage game. In the first stage, all firms simultaneously choose their own number of products. In the second stage, firms make...