the advantage of a postapocalyptic setting is that it can be made on the cheap . 
(ROOT (S (NP (NP (DT the) (NN advantage)) (PP (IN of) (NP (DT a) (JJ postapocalyptic) (NN setting)))) (VP (VBZ is) (SBAR (IN that) (S (NP (PRP it)) (VP (MD can) (VP (VB be) (VP (VBN made) (PP (IN on) (NP (DT the) (JJ cheap))))))))) (. .)))
(ROOT (S (NP (NP (DT ) (NN )) (PP (IN ) (NP (DT ) (JJ ) (NN )))) (VP (VBZ ) (SBAR (IN ) (S (NP (PRP )) (VP (MD ) (VP (VB ) (VP (VBN ) (PP (IN ) (NP (DT ) (JJ ))))))))) (. )))