From 2009 to 2014, Eastlandia experienced large fluctuations in both aggregate consumer spending and disposable income, but wealth, the interest rate, and expected future disposable income did not change. The accompanying table shows the level of aggregate consumer spending and disposable income in millions of dollars for each of these years. Use this information to answer the following questions.

a. Plot the aggregate consumption function for Eastlandia. 

b. What is the marginal propensity to consume? What is the marginal propensity to save?

c. What is the aggregate consumption function?

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Disposable income (millions of dollars) Consumer spending (millions of dollars) Year $100 $180 2009 350 2010 380 2011 300 340 2012 400 420 375 2013 400 500 500 2014