What were the extremists answer to the cause of the black plague

Plague doctor

Explanation:

an era of negotiation.

is that an answer to your question?

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.