Does the Fed have complete control over U.S. interest rates; that is, can it set rates at any level it chooses? Why or why not? What is country risk?

Fed stimulate the economy
How does the Fed stimulate the economy? How does the Fed affect interest rates? Does the Fed have complete control over U.S. interest rates; that is, can it set rates at any level it chooses? Why or why not?
What is country risk?
What is exchange rate risk?
On what two factors does the return on a foreign investment depend?

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