If two commodities are substitutes, then
a. they tend to be used together by consumers
b. their prices are generally regulated by the government
c. an increase in the price of one of them increases the supply of the other
d. the cross-price elasticity of demand is positive
e. the cross-price elasticity of demand is negative
D
Economics
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How can a firm have a negative valued added, as supposedly some state-owned businesses did in the former Soviet Union? What has to be true for value added to be negative?
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