4. Check out the figure below: MoneyGame Chart of the Day Estimated Saving Rate For Different Income Levels, % 60 51.2 50 37.2 40 30 23.6 17.3 20 11.1 10 0.14 0.09 0 Quintile Quintile Quintile Quintile Quintile Top 5% Top 1% 1 2 3 5 Source: "Do the Rich Save More?" Journal of Political Economy, Karen Dynan, Jonathan Skinner, Stephern Zeldes, volume 112, no. 2, 2004 What does the above graph imply about the relationship between income levels and saving rates? How should one modify the model given the above evidence and how would the conclusions be different