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Price Point Impact. Even with a linear demand curve, price elasticity for any product. (including tobacco) varies as the price for that product varies. De-. mand tends to be relatively inelastic at lower price levels (due to. smaller income effects), but grows more elastic as price increases.
When the price level falls, consumers are wealthier, a condition which induces more consumer spending. Thus, a drop in the price level induces consumers to spend more, thereby increasing the aggregate demand. The second reason for the downward slope of the aggregate demand curve is Keynes's interest-rate effect. Recall that the quantity of money demanded is dependent upon the price level. That is, a high price level means that it takes a relatively large amount of currency to make purchases.