According to Wicksell, when the market rate is below the natural rate, there is an incentive to borrow and reinvest in an economy at the higher natural rate. This normally leads to an economic boom until demand drives up the market rate and eventually chokes off demand. When the market rate exceeds the natural rate, borrowing slows along with economic activity eventually leading to a recession, and the market rate again falls back below the natural rate. Wicksell viewed the divergences between the natural rate and the market rate as the mechanism by which the economic cycle is determined. If a divergence between the natural rate and the market rate is abnormally sustained, it causes a severe misallocation of capital.