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:
Neuromuscular Junction
The synapse or connection between a motor neuron and a skeletal muscle cell, enabling muscle contraction.
Sarcolemma
The plasma membrane of a muscle cell that encloses the cytoplasm of the cell, playing a role in muscle contraction.
Axon Terminal
The distal terminations of the branches of an axon, facilitating transmission of nerve impulses to other neurons or muscle cells.
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