Go to the St. Louis Federal Reserve FRED database, and find data on the personal consumption expenditure price index (PCECTPI), the unemployment rate (UNRATE), and an estimate of the natural rate of unemployment (NROU). For the price index, adjust the units setting to "Percent Change From Year Ago." Select the data from 2000 through the most current data available, download the data, and plot all three variables on the same graph. Using your graph, identify periods of demand-pull or cost-push movements in the inflation rate. Briefly explain your reasoning.