Advocates of the free market contend that government intervention hampers economic growth by disrupting the natural allocation of resources according to supply and demand while critics of the free market contend that government intervention is sometimes necessary to protect a country's economy from better-developed and more influential economies, while providing the stability necessary for wise long-term investment. Milton Friedman pointed to failures of central planning, price controls and state-owned corporations, particularly in the Soviet Union and China while Ha-Joon Chang cites the examples of post-war Japan and the growth of South Korea's steel industry.