1. Download from the FRED database (1: https://fred.stlouisfed.org/) and compare the time se- ries from 1970 to to the most recent data for plots of 1-year US Treasury Bills (TB1YR), long- term (10-year) US Treasury Bonds (IRLTLTOIUSM156N), the three-month AA nonfinan- cial commercial paper rate (CPN3M) and the 30-year conventional mortgage rate (MORT- GAGE30US). (1) How do the time series compare? (5 points) (2) Why is one higher than the other? (5 points) (3) How do this interest rates behave during the recessionary and expansionary phases, and why? (5 points) (4) What are the impacts of COVID-19 crisis? (5 points)