here're my questions. Thank you so much!

Which of the following statements about an increase in aggregate demand is false? . An increase in aggregate demand can be the result of another country's central bank selling large quantities of their government's bonds. . An increase in aggregate demand can be caused by a decrease in other countries' interest rates. . An increase in aggregate demand will result in no change in the price level in the Keynesian model. . The increase in aggregate demand resulting from an open market operation does not depend on the slope of the aggregate supply curve. . An increase in aggregate demand will have no effect on GDP in the classical model. If an economy starts out in long-run equilibrium and people become more optimistic about the future of the economy, this will lead to: CA. A decrease in real output, an increase in the price level, decreasing wages, and an increase in real output to return to long-run equilibrium. . An increase in real output, a increase in the price level, increasing wages, and a decrease in real output to return to long-run equilibrium. . A decrease in real output, a decrease in the price level, decreasing wages, and an increase in real output to return to long-run equilibrium. . A decrease in real output, an increase in the price level, increasing wages, and an increase in real output to return to long-run equilibrium. . An increase in real output, a decrease in the price level, decreasing wages, and a decrease in real output to return to long-run equilibrium. When the economy is in a severe recession, an increase in aggregate demand will lead to: O A. a big increase in real GDP and a smaller increase in the price level. 0 B. an increase in the long-run equilibrium level of output. 0 C. a big increase in the price level and a smaller increase in real GDP. 0 D. a decrease in the long-run equilibrium level of output. 0 E. Both an increase in the long-run equilibrium level of output and a big increase in real GDP and a smaller increase in the price level. A household pays $5,000 in taxes and has an autonomous consumption of $10,000 and a marginal propensity to consume of 0.8. How much will that household save if its income is $50,000