The recovery following a depression is based on replacement of labor-intensive techniques that have become uneconomic at the low prices and profit margins following the crash. This new investment in less labor-intensive technology takes market share from competitors by producing at lower cost while also lowering the average rate of profit and thus explains the actual mechanism for both economic growth with improved technology and a long run tendency for the rate of profit to fall. The recovery eventually leads to another boom because the lag for gestation of fixed capital investment results in prices that continue such investment until eventually the completed projects deliver overproduction and a crash.