3. If Petunia maximizes her profit, how much profit does she make?(5%)

4. What is Petunia's shutdown point? What is her economic profit at the shut-down point?(5%)

5. Should Petunia shut down? Will farms with costs the same as Petunia's enter or exit the milk market? Explain.(5%)

三、 (20%) 支出 百萬美元 民間消費支出 (Personal consumption expenditure) 80 政府購買 (Government expenditure on goods and services) 30 淨稅收(Net taxes) 35 國內投資支出 (Gross private domestic investment) 20 進口(Imports of goods and services) 10 出口(Exports of goods and services) 20 1. 使用上表的資訊來計算淨出口(10%)

2. 使用上表的資訊來計算國內生產毛額(10%)

四、 (30%) Price level Real GDP demanded (billions of 2005 dollars) Real GDP supplied (billions of 2005 dollars) 90 450 150 100 400 250 110 350 350 120 300 450 130 250 550 The table above shows Yellowland's economy aggregate demand and supply schedules. Yellowland's potential GDP is $300 billion. 1. Plot the aggregate demand curve, the short-run aggregate supply curve, and the long-run aggregate supply curve.(5%)

2. What are the short-run equilibrium real GDP and price level in Yellowland?(5%)

3. What is the long-run equilibrium real GDP?(5%)

4. Is Yellowland's short-run macroeconomic equilibrium a full-employment equilibrium, below full-employment equilibrium, or above full-employment equilibrium? What is the recessionary gap (if any)? What is the inflationary gap (if any)?(5%)

5. Suppose aggregate supply decreases by $150 billion. Plot the new aggregate supply curve. How do real GDP and the price level change in the short run?(5%)

6. Is Yellowland's new short-run macroeconomic equilibrium a full-employment equilibrium, below full-employment equilibrium, or above full-employment equilibrium? What is the recessionary gap (if any)? What is the inflationary gap (if any)?(5%)

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