Social market economy's success story from the 1960s to the 1980s

1-) Why was the social market economy such a success story from the 1960s to the 1980s? What changed to make it seem less successful, and what does that teach us about the prospects for more extensive government intervention in the economy in the future? Like Germany, Japan had a very successful economic model that fell on hard times in the 1990s. What changed to make the model less successful? How does this compare with the decline of Germany's social market economy model? What do both teach us about the future of CMEs in the face of globalization?                                                                                                                          

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