You are missing the correct answer:
No/Yes. The wall will not be built, but we - among others - will pay for it.
Rather funny and reminds me of a Russian anecdote (
http://samlib.ru/j/jacko_w_a/anecdotes.shtml)
General Secretary Brezhnev came on an official visit to the USA. In the White House he was invited to dinner and seeing the table laid with caviar, expensive vines, etc. asked President Carter: "Russian people would like to know where you got money to pay for such an expensive dinner". President Carter asked Brezhnev to come up to the window and said: "Can you see that bridge?" Brezhnev nodded in the affirmative. "Well", - proceeded Carter, - "We had in the budget $100 million allotted for the construction of the bridge. But we found a firm that built the bridge for $80 million. So we saved money and can afford such dinners".
Some time later President Carter visited Russia and in the Kremlin was invited to dinner. He saw the table laid with caviar, expensive vines, etc., and asked Brezhnev: "American people would like to know where you got money to pay for such an expensive dinner". Brezhnev asked Carter to come up to the window and said: "Can you see the bridge?" Carter began looking around staring intensely and finally said: "No, I can't!" "That is why we can afford such dinners", - explained Brezhnev.