valley. (building construction). An inside angle formed where two sloping sides intersect. (geography). A generally broad area of flat, low-lying land bordered by higher ground.
In ordinary usage, price is the quantity of payment or compensation given by one party to another in return for goods or services.
Meaning. The economic theory, and also the lay opinion, that whatever goods and services are provided, they must be paid for by someone-that is, you don't get something for nothing. The phrase is also known by the acronym of 'there ain't no such thing as a free lunch' - tanstaafl.