Unlike goods that can be inventoried, services cannot be stored. A vacant airline seat, an empty hotel room, or an unused hour for a consultant are wasted opportunities. This is referred to as of services.

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.