During his lifetime what was muhhamed known for

the answer is a) high entry costs

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.

state law

most seat belt laws in the united states are left to the states. however, the first seat belt law was a federal law.