What is the formula for change in GDP (🔼GDP/Y)?

The formula for change in GDP, represented as 🔼GDP/Y, is correctly identified as the multiplier times the change in aggregate demand (🔼AD). This relationship is fundamental in Keynesian economics, where the multiplier effect illustrates how an initial change in spending (such as an increase in business investment or government expenditure) leads to a more than proportional change in GDP.

When aggregate demand increases, it leads to higher levels of production and income, which can result in further spending by consumers and businesses. The multiplier reflects this chain reaction, quantifying how much GDP will increase as a result of an initial rise in aggregate demand. Hence, if you know the size of the shift in aggregate demand and the multiplier, you can calculate the total change in GDP, making this option the most accurate representation of the relationship between GDP and aggregate demand.

The other choices do not accurately reflect the relationship between changes in GDP and other economic variables as outlined in economic theory.