Declining worker bargaining power has been advanced as an explanation for dramatic generational changes in the U.S. macroeconomic environment such as the substantial decline in labor’s share of the national income, the loss of consumer purchasing power, and growing income and wealth inequality. In this paper, we investigate microeconomic implications by examining the effect of declining worker power on firm-level investment responses to a labor cost shock (mandated increases in the minimum wage). Over the past four decades, we find that investment-wage sensitivities go from negative to insignificant as management becomes less constrained and can pursue outside options. Consistent with drivers of weakening worker power, investment-wage sensitivity changes are more significant for firms that are more exposed to globalization, technological change, and declining unionization.