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:
Legal Barriers
Restrictions imposed by law that limit the entry of new firms into an industry or protect existing firms from competition.
Predatory Pricing
A pricing strategy where a company sets prices below cost to eliminate competition and establish a monopoly over time.
Economies of Scale
Cost advantages that enterprises obtain due to their scale of operation, resulting in a reduced cost per unit.
Legal Barriers
Restrictions or regulations established by law that limit entry or operation in certain markets or industries.
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