Which of the following historical developments contributed most directly to the market revolution?

The emergence of new forms of transportation

Explanation: New trade routes, means of transportation, and other emerging innovations contributed to the forming of the market revolution during this time

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.