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

This paper provides evidence that shifts in the occupational composition of the U.S. workforce are the most important factor explaining the trend decline in the labor share over the past four decades. Estimates suggest that while there is unitary elasticity between equipment capital and...