What financial instruments grew as a result of a market economy during the Tang and Song dynasties in China?

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john maynard keynes developed new economic theories in response to the : b) great depression of the 1930s. his theories are so important that they are known as "keynesianism". in his works he supports the idea of a government with deeper involvement and intervention to end the great depression.

because it took place after the war of 1812 had come to an end.

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