Define the inflation rate. (b) describe how the CPI differs from the PPI, as a measure of the U.S. inflation rate. (c) Why is inflation risk a business management risk? (d) Which would be better, for the U.S. economy, a low stable inflation rate or deflation? describe. (e) What U.S. government organization is primarily responsible for controlling the U.S. inflation rate, while helping to reduce cyclical unemployment and increase the U.S. economic growth rate?