Since the second half of the 1990s, Japan has tried to promote the use of the yen as an international currency but has made little progress so far. Now, following in Japan’s footsteps, the People’s Republic of China (PRC) is promoting the internationalization of the renminbi. It would do well to consider why Japan’s attempt at internationalizing the yen has failed. Until the Asian financial crisis in the second half of the 1990s, Japan was reluctant to promote the internationalization of the yen, fearing that capital flows could destabilize the economy and render monetary policy ineffective, a problem widely considered to be the major cost for a country promoting the international use of its currency.