In the following graph, MPC and MSC represent the marginal private cost and marginal social cost of producing a good respectively. QD represents the demand for the good. Refer to the graph to answer the question. 
The private firm will maximize profits by producing _____ of the good.
Definitions:
Industry Supply
The total output of a specific good or service produced by all firms in an industry at various price levels.
Industry Demand
The total demand for all the goods or services produced by a particular market sector.
Perfectly Elastic
Describes a situation where the quantity demanded or supplied responds infinitely or by unlimited quantity to any change in price, represented graphically as a horizontal line.
Quantity Demanded
The amount (number of units) of a product that a household would buy in a given period if it could buy all it wanted at the current market price.
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