The accurate description of the economy's reaction to changes in reserve requirements is:
If the reserve requirements tightened, more funds are in reserves and banks do not have as much to lend, leading to an increase in interest rates for customers and a decrease in economic growth.
This statement accurately reflects the dynamics of reserve requirements. When reserve requirements are tightened, banks must hold a larger portion of their deposits as reserves, which reduces the amount of money they can lend out. This reduction in lending often results in higher interest rates for customers and can lead to slower economic growth.