Schumpeter made a fundamental distinction between economic growth and economic development. Economic growth, for Schumpeter, is a gradual, continuous, and reversible process, representing quantitative changes that occur within the existing economic structure (e.g., increase in savings, population, capital). Economic development, on the other hand, is a discontinuous, spontaneous, and irreversible process driven by "innovations" introduced by entrepreneurs. These innovations disrupt the existing equilibrium ("stationary state") and lead to qualitative changes in the economic structure.