Market demand is aggregation of individual demand
Vertically
Horizontally
Both (a) and (b)
None
Market demand is aggregation of individual horizontal demand curves.
A. All levels of demand, whether individual, aggregate, local, national or international are subject to change. B. At the same time, science and technology add new dimensions to products, their uses, and the methods used to market them. C. Aggregate demand fluctuates with changes in the level of business activity, GNP, and national income. D. The demands of individuals tend to vary with changing needs and rising income.