Refer to the diagram below.The equilibrium condition for a private closed economy is Ig = S. 
Definitions:
Deadweight Loss
The decline in economic productivity due to the failure to achieve or the impossibility of achieving equilibrium for a specific good or service.
Profit per Unit
The financial gain obtained on each unit sold, calculated by subtracting the cost per unit from the selling price per unit.
Demand Curve
A graph showing the relationship between the price of a good and the quantity of that good consumers are willing to purchase at various prices.
Marginal Cost Curve
A graphical representation that shows the change in the total cost of producing one more unit of a good.
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