Offer your thoughts or opinion on the input financial query or topic using your financial background.

What is the main purpose of FED increase and decrease interest rate? 
When inflation is high or is rising generally interest rates will be raised to reduce people spending their money and slow down the rate of inflation. As interest rates rise people will be less willing to borrow money and more willing to keep their money earning a good interest rate in the bank. People will reduce their spending and invest less into alternative assets but instead put more into their bank savings. When inflation is too low and the economy is starting to slow down generally interest rates will be raised to encourage more spending to restart the economy again. As interest rates drop more will take their saving out of their bank accounts as is starts to earn very little in interest rate and more will be willing to borrow as it becomes cheaper to borrow. People will start spending more and investing their money outside of bank savings.