Paying rent is a needwhile buying a new video game is a want  if you buy a new video game, you cannot pay your cell phone bill. this is an example setting a long term goalsetting a short term goalrealizing opportunity cost

Which of the statements best describes why the aggregate demand curve is downward sloping? an increase in the aggregate price level causes consumer and investment spending to fall, because consumer purchasing power decreases and money demand increases. as the aggregate price level increases, consumer expectations about the future change. as the aggregate price level decreases, the stock of existing physical capital increases. as a good's price increases, holding all else constant, the good's quantity demanded decreases.