sider the following two services:book publishing and magazine publishing. We will say that economies of scope exist between wo services ifA. the cost of publishing a magazine is lower for book publishers than for other firms.B$.$ the cost of publishing a magazine is lower for firms that publish many magazines than for firms that publish only one magazine... the cost of publishing a book falls over time as the publisher acquires more experience.the cost of publishing a book is not subject to diminishing marginal returns.XIl the