What type of front is illustrated in the diagram below? 
Definitions:
Marginal Revenue
The additional income earned by selling one more unit of a product or service.
Profit-Maximizing Level
The point at which a firm produces at a level where the difference between total revenue and total cost is the greatest.
Marginal Revenue
The additional income earned by selling one more unit of a good or service.
Normal Good
A product or service whose demand increases as consumers' income increases, typically reflecting higher purchasing power.
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