Answer the question below:

Assume no government and no foreign trade. Assume fixed prices and interest rates. Assume an economy's planned aggregate expenditure function is as follows: AEplgnneg = 800 + 0.6Y See that disposable income (YD) and GDP (Y) are the same, so I will use Y in the AEplanned function. 1.) What's the marginal propensity to consume in this economy? 2.) What is the equilibrium Y (GDP) in this economy? 3.) What is the equilibrium Y if autonomous aggregate spending increases by 150