The price is the point at which supply and demand for a good are equal.

a. elastic
b. middle
c. perfect
d. market

D. Market

Explanation:

Market makes the most sense in the sentence the market price we here this term alot their is the market price and than there is the consumers price

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1) the stages a new product goes through from beginning to end, i.e., the stages that a product passes through from introduction through growth, maturity, and decline. 2) the time from initial research and development to the time at which sales and support of the product to customers are withdrawn. 3) the period of time during which a product can be produced and marketed profitably.

                                          hope it