The figure shows planned aggregate expenditure and output for an economy. 
Suppose that the economy's output is Y1. This level of GDP would be considered:
Definitions:
Complements
Goods that are often used together, where an increase in the demand for one leads to an increase in the demand for the other.
Cross-Price Elasticity
A measure of how the quantity demanded of one good changes in response to a price change of another good.
Complementary Goods
Products or services that tend to be used together, where the consumption of one enhances the use of the other.
Income Elasticity
A measure of how much the demand for a good changes in response to a change in consumers' income.
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