Many important economic theories develop as a result of

Many important economic theories develop as a result of particular economic crises facing societies. Can you locate any such cases with Thomas Malthus David Ricardo and Karl Marx? Would this apply to any developments in the last 50 years in the United States?
Many important economic theories develop as a result of particular economic crises facing societies. Can you locate any such cases with Thomas Malthus David Ricardo and Karl Marx? Would this apply to any developments in the last 50 years in the United States?

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