The Japanese economic miracle refers to Japan's record period of economic growth between the post-World War II era and the end of the Cold War. During the economic boom, Japan rapidly became the world's second-largest economy (after the United States). By the 1990s, Japan's population demographics had begun to stagnate, and the workforce was no longer expanding as quickly as it had in the previous decades despite per-worker productivity remaining high. This economic miracle was the result of post-World War II Japan and West Germany benefitting from the Cold War. The American government reformed Japanese society during the occupation of Japan, making political, economic and civic changes. It occurred chiefly due to the economic interventionism of the Japanese government and partly due to the aid and assistance of the U.S. aid to Asia. After World War II, the U.S. established a significant presence in Japan to slow the expansion of Soviet influence in the Pacific. The U.S. was also concerned with the growth of the economy of Japan because there was a risk that an unhappy and poor Japanese population would turn to communism and by doing so, ensure Soviet control over the Pacific. The distinguishing characteristics of the Japanese economy during the "economic miracle" years included: the cooperation of manufacturers, suppliers, distributors, and banks in close-knit groups called keiretsu; the powerful enterprise unions and shuntō; good relations with government bureaucrats, and the guarantee of lifetime employment (shūshin koyō) in big corporations and highly unionized blue-collar factories. However, some scholars argue that Japan's postwar growth spurt would not have been possible without Japan's alliance with the United States, since the United States absorbed Japanese exports, tolerated controversial Japanese trade practices, subsidized the Japanese economy, and transferred technology to Japanese firms; thereby magnifying the effectiveness of Japanese trade policy.
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