Use the graph below to explain the determination of equilibrium GDP by the aggregate expenditures-domestic output approach.At equilibrium C + Ig = Real GDP ($550 + $50 = $600).Why does the intersection of the aggregate expenditures schedule and the 45-degree line determine the equilibrium GDP? 
Definitions:
Normal Population
A population that follows a normal distribution, where the mean, median, and mode are equal, and the data symmetrically distributes around the mean.
Degrees Of Freedom
The quantity of unique variables or figures permissible in a statistical distribution adhering to set restrictions.
Chi-squared Test
A statistical method used to determine if there is a significant association between two categorical variables.
Null Hypothesis
A theory positing no substantial variance between designated groups, attributing any noted disparity to errors in sampling or experimentation.
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