Find 
and 
such that 
is a unit vector parallel to 
where 
and 
.
Definitions:
Monopolistic Competition
A market structure characterized by many firms selling products that are substitutes but differentiated from each other in some way.
Demand Curve
A graph showing the relationship between the price of a good and the quantity of that good that buyers are willing to purchase at various prices.
Marginal Revenue
The increase in revenue that results from the sale of one additional unit of output.
Monopolistically Competitive
A market structure where many firms sell products that are similar but not identical, allowing for some degree of market power and differentiated competition.
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