Sketch a graph of the equation 
Definitions:
Demand Curve
A graphic representation showing how the quantity demanded of a good or service varies with its price.
Marginal Cost
The hike in complete costing that comes with the fabrication of an additional unit of a good or service.
Competitive Buyer
A buyer in a market who cannot influence the market price and takes the price as given.
Marginal Expenditure
The rise in expense from obtaining one more unit of a good or service.
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