試題詳解

9. John, Ethan, and Mary decide to buy a bike together and share the ownership. There willingness to pay for each choice is in the following table They will choose the bike that all three agree to buy.Which following statement(s) is(are) correct? 

(i) The bike will be a publie good among them.
(ii) If three people share the cost and all bikes have the same price, $1500, the choice that maximizes aggregate surplus will be chosen.
(A) (i)
(B) (ii)
(C) (i) and (ii)
(D) None of the above is correct.