These graphs show how world-record performance in (A) track and (B) field events vary with age. What phenomenon do these data demonstrate? 
Definitions:
Price
The expected, necessary, or contributed financial amount in exchange for something.
Total Revenue
The complete amount of income generated by the sale of goods or services related to the company's primary operations.
Quantity Demanded
The total amount of a good or service that consumers are willing and able to purchase at a given price level in a given time period.
Price
The amount of money expected, required, or given in exchange for something.
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