In a market economy, market prices are determined through buying and decisions. [government] [selling] [consuming]

The answer is: Selling

The market price refers to the price that offered in order for certain types of products  to be acquired by consumers.

The buying and selling activities in the market economy would constantly moving until eventually it find an equilibrium spot where both sellers and consumers perceived as fair.

there are indirect ways of affecting state laws   by with holding funding's. and that's why we have a 55mph speed on the high way with a design of 70mph speed.

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