Explain why, in the long run, a change in prices has no impact on output. What impactdoes aggregate demand have in determining output in the long run?

In the long run, a change in prices does not impact output due to the concept of money neutrality. Money neutrality is an economic theory which suggests that changes in the money supply only affect nominal variables and not real variables. In other words, increasing or decreasing the amount of money in an economy will change prices, but not the actual output. This is because in the long run, resources and technology, which determine the potential output, remain constant. Therefore, changes in the price level will not affect the quantity of output produced.

Aggregate demand, on the other hand, does not determine output in the long run. This is because in the long run, the economy's output is determined by factors such as labor, capital, natural resources, and the available technology, not the level of demand. In the long run, the economy is said to be supply-constrained, meaning it can only produce a certain amount of goods and services, regardless of the level of demand.

However, changes in aggregate demand can affect the price level in the long run. If aggregate demand increases, prices will rise as businesses try to meet the increased demand with a fixed level of output. Conversely, if aggregate demand decreases, prices will fall as businesses try to sell their fixed level of output to a smaller number of buyers.

In conclusion, while changes in prices and aggregate demand can affect the economy in the short run, in the long run, the economy's output is determined by supply-side factors, not demand-side factors.