The signal would be: prices.
When the prices of a certain product is high, it would give signals to the seller to increase the production of that product.
the prices also determine how much material and type of production technique that the sellers can afford to use.
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Explanation: please post your full question i mean title of this question
Explanation:
I thought it was like a term used in the United States for American political parties other than the Republican and Democratic parties.