The correct answer is <span>They are bought and sold by the people.
They are bought and sold based on the principles of supply and demand. People work for money and then use the money to spend it wherever they want. This is opposite to some systems of controlled markets where goods are distributed based on necessity like in some communist regimes.</span>
A presidential candidate promotes a "campaign platform" during the campaign, the goals of which generally transfer the goals into the "presidential agenda".
