advertisement - a sign or announcement for a product, service, or idea

consumer - a person who buys something

corporate ad - an ad that gives consumers a positive idea of a company and its services

determine - to decide

enterprise - a business

equilibrium price - the point where supply and demand meet

goods - products

motivation - a reason for buying something

political ad - an ad that tries to get someone to vote for a political position

product ad - an ad that tries to make people want to buy products

profit - to earn money (v); money earned from a business (n)

public service ad - an ad that gives information to the public

shortage - not enough of something

supply - to give or provide (v); an amount (n)

surplus - an oversupply, too many of something

target - to direct ads toward a particular group of people (v); possible buyers for a product (n)

(the) free enterprise system - a system in which individuals and groups own businesses

(the) law of demand - consumers buy more of a product at a lower price

(the) law of supply - producers supply more of a product at a higher price

(the) market - the exchange of goods and services by buyers and sellers