A 1-in.-larger rim diameter and 1-in.-wider rim width is a Plus 1 size upgrade; in this case, the 16-in. rim below. Plus 2 and 3 are shown, slightly exaggerated, on the 17- and 18-in. wheels. Choose a tire that's close to stock height.
(Technically, in the context of aggregate demand, the Y on the horizontal axis represents aggregate expenditure .) As it turns out, the aggregate demand curve also slopes downwards, giving a similar negative relationship between price and quantity that exists with the demand curve for a single good.
Since aggregate demand is measured through market values, it only represents total output at a given price level, and does not necessarily represent quality or standard of living. The Keynesian equation for aggregate demand is: AD = C+I+G+(Nx)