This paper analyzes the effect on GDP growth of income (GDP per capita) and economic regulation. A simple theoretical framework presents two opposing views. We analyze the empirical relation using a non-linear dynamic panel data model with fixed effects. The result shows that the effect of regulation on growth depends on income. For low-income countries, there is little effect of changing regulation. For highly regulated middle-income countries, deregulation can increase growth. For high-income countries, deregulation leads to higher growth. Holding regulation constant, there is catch-up growth with a maximum at an intermediate income level.