The amount of the external marginal cost per ton illustrated in the above figure is

Which is the main disadvantage of using shells as money instead of coins?

a. durability b. portability c. uniformity d. divisibility

When the cross elasticity of demand between one product and all other products is low, one is generally referring to a(n) ____ situation

a. oligopoly b. monopoly c. pure competition d. substitution e. monopolistic competition