Since 1980, the earnings share of older workers has risen in the United States. At the same time, labor's share of income has declined significantly. We hypothesize that an aging workforce has contributed to the decline in labor's share of income. We formalize this hypothesis in an on-the-job...

We estimate an aggregate elasticity of substitution between capital and labor near or below one, which implies that capital deepening cannot explain the global decline in labor's share. Our methodology derives from transition paths in the neo-classical growth model. The elasticity of...