What does a rise in the price of beef indicate in a market economy?

Explanation

Option A is incorrect because in a market economy, prices are determined by supply and demand, not by planning boards. Option B is misleading as the price change in beef does not directly instruct consumers to buy less pork. Option C is correct since higher prices typically encourage producers to supply more of that good. Option D is incorrect because an increase in price usually discourages consumers from buying more.