Most developed economies have experienced large declines in risk-free interest rates and lacklustre investment over the past 30 years, while the profitability of private capital has increased slightly. Using an extension of the neoclassical growth model, this column identifies what accounts for these developments. It finds that rising market power, rising unmeasured intangibles, and rising risk premia play a crucial role, over and above the traditional culprits of increasing savings supply and technological growth slowdown.