Digital currency founded DigiCash, an electronic cash company, in Amsterdam to commercialize the ideas in his research. It filed for bankruptcy in 1998. In 1999, Chaum left the company. In 1997, Coca-Cola offered buying from vending machines using mobile payments. After that PayPal emerged in 1998. Other systems followed suit, such as e-gold, but it faced issues because it was used by criminals and was closed by U.S Department of Justice in 2005. In 2008, bitcoin was introduced, which marked the start of digital currencies. Origins of digital currencies date back to the 1990s Dot-com bubble. One of the first was E-gold,
Currency War of 2009–11 the rise in the Euro in the latter half of 2010 was China's purchase of Euro-denominated bonds. While China's intervention was in some ways helpful for the Eurozone, it also generated concern with several European officials speaking out against the action. These officials included: ECB governor Jean-Claude Trichet and Eurogroup president Jean-Claude Juncker. Japan also has a large current account surplus, and in 2009 and 2010 the country allowed the Yen to appreciate. However, in September 2010 Japan twice intervened to effect a devaluation. Japan has a number of challenges that limit its ability to allow ongoing currency appreciation, including