Plot the percentage change from a year earlier of the value of the S&P 500 stock index (FRED code: SP500 and use the data for monthly frequencies). Visually, has the risk of the S&P 500 index changed over time?\ (Hint: Change the Frequency dropdown box to "Monthly," change the Units dropdown box to "Percent\ Change from Year Ago.")

Plot the percentage change from a year earlier of the value of the S\&P 500 stock index (FRED code: SP500 and use the data for monthly frequencies). Visually, has the risk of the S\&P 500 index changed over time? (Hint: Change the Frequency dropdown box to "Monthly," change the Units dropdown box to "Percent Change from Year Ago. ") Plot the percentage change from a year earlier of the value of the S\&P 500 stock index (FRED code: SP500 and use the data for monthly frequencies). Visually, has the risk of the S\&P 500 index changed over time? (Hint: Change the Frequency dropdown box to "Monthly," change the Units dropdown box to "Percent Change from Year Ago. ")