This graph shows the position of an element of air as a function of time as a sound wave passes through it.Which letter corresponds to the period of the wave? 
Definitions:
Average Cost
The total cost of production divided by the total quantity produced, indicating the cost per unit of output.
Monopolist
An individual or entity that holds exclusive control over the supply of a particular goods or service, allowing them to manipulate market conditions.
Marginal Cost
The increase in total production cost that arises from producing one additional unit of a good or service.
Average Cost
The total cost of production divided by the number of goods produced, also known as unit cost.
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