The aim of this chapter is to analyze the three depressions of Turkish economy, which are the period of Second World War, the second half of the 1970s, and between 1994 and 2001. In these depression periods, the supply-demand balance completely deteriorated, and the economy completely collapsed. The economic paradigm changed after each depression, but economic problems have never changed. As very different economical models, étatism, planning import substitution industrialization, neoliberal economy policies have been tested for Turkish economy, but none of them has been successful. The lack of knowledge of facts of economics is the main cause of depressions. For innovative strategy, the Turkish economy needs more free market and deregulation.