From Individual to market demand Functions p1 p vddd 20 5 p1 The horizontal sum p of the demand curves of individuals a and B 35 A x1+x1From Individual to Market Demand Functions p1 p1 x A 1 * x B 1 * x x A B 1 1 * + p1 20 15 35 p1 ’ p1 ” p1 ’ p1 ” p1 ’ p1 ” The “horizontal sum” of the demand curves of individuals A and B