Japan is the third-largest national economy in the world, after the United States and China, in terms of nominal GDP, and the fourth-largest national economy in the world, after the United States, China and India, in terms of purchasing power parity . , Japan's labor force consisted of 67 million workers. Japan has a low unemployment rate of around 2.4 percent. Around 16 percent of the population were below the poverty line in 2017. Japan today has the highest ratio of public debt to GDP of any developed nation, with national debt at 236% relative to GDP as of 2017. The Japanese yen is the world's third-largest reserve currency (after the US dollar and the euro).