What is a real money balance? If the nominal money supply increases 20 percent while prices increase 20 percent, what happens to the demand for real money balances? What happens to the supply of real...

What is a real money balance? If the nominal money supply increases 20 percent while prices increase 20 percent, what happens to the demand for real money balances? What happens to the supply of real money balances?

Does the natural level of unemployment ever change? If it does, explain why.