15.Consider a closed economy with demand for goods as follows:

= + +

= 200 + 0.80( )

= 600

= 1000

= 1000

a.What is "autonomous expenditure" for this economy?

b.Graph this economy's (planned) aggregate expenditure function.Be sure to give the coordinates of at least 2 distinct points in your graph.

c.According to the Keynesian Cross model of income determination, what would be the short run equilibrium value of real aggregate income (Y) for this economy?

d.If government purchases (G) were to increase to 1,200, what would the new short run equilibrium value of income be?