Supply and Demand: This is an economic model which states that the price for a good will settle at a point where the quantity demanded by consumers equals the quantity supplied by producers.
Advertising: A marketing communication tool used to promote or sell something - including goods, services, or ideas.
Disposable Income: The amount of money that households have available for spending and saving after income taxes have been accounted for. It's often monitored as one of many key economic indicators used to gauge the overall state of the economy.