What type of structure is shown in this figure? 
Definitions:
Marginal Cost
The expenditure incurred from creating one more unit of a product or service.
Total Variable Cost
The total of expenses that vary directly with the level of production or output.
Marginal Cost
The increment in expense for generating an additional unit of a product or service.
Swords
Edged weapons, longer than a knife or dagger, used historically in warfare or personal combat for cutting or thrusting.
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