
This model would be used, for example, in the famous Pied Piper of Hamelin story:
Who will pay for ridding the town of rats?
Who will pay the piper? Who pays the piper calls the tune.
"The wall" is not the direct object, but the indirect one, so a preposition is needed.
Who will pay for the wall?

+1
Should be "Who will pay for the wall?"
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This sentence was initially added as a translation of sentence #5048988
added by al_ex_an_der, April 7, 2016
linked by al_ex_an_der, April 7, 2016
linked by al_ex_an_der, April 7, 2016
linked by duran, April 8, 2016
edited by AlanF_US, October 21, 2019
linked by CK, October 21, 2019