The figure shows planned aggregate expenditure and output for an economy. 
Suppose that the economy starts at PAE2. Which change would cause a move from PAE2 to PAE3?
Definitions:
Normal Distribution
In this type of distribution, occurrences of data are more frequent near the mean and decrease in frequency as they move away from the mean, with the distribution being symmetric.
Sampling Distribution
The probability distribution of a statistic based on random samples from a population, used to estimate population parameters.
Standard Deviation
An indicator of the degree to which a dataset's values vary or are dispersed, showing the extent of deviation from the average.
Normal Distribution
A distribution of probabilities that is even on both sides of the mean, illustrating that values near the mean happen more often than values at a greater distance from the mean.
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