Michael B. Wachter of the University of Pennsylvania and his colleagues conclude that there is a wage and fringe benefit premium for the postal bargaining labor force of 29.
( ( ( Michael ( B. Wachter ) ) ( of ( ( the University ) ( of ( ( Pennsylvania and ) ( his colleagues ) ) ) ) ) ) ( ( conclude ( that ( there ( is ( ( a ( wage ( and ( fringe ( benefit premium ) ) ) ) ) ( for ( ( the ( postal ( bargaining ( labor force ) ) ) ) ( of 29 ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Michael) (NNP B.) (NNP Wachter)) (PP (IN of) (NP (NP (DT the) (NNP University)) (PP (IN of) (NP (NP (NNP Pennsylvania)) (CC and) (NP (PRP$ his) (NNS colleagues))))))) (VP (VBP conclude) (SBAR (IN that) (S (NP (EX there)) (VP (VBZ is) (NP (NP (DT a) (NN wage) (CC and) (NN fringe) (NN benefit) (NN premium)) (PP (IN for) (NP (NP (DT the) (JJ postal) (NN bargaining) (NN labor) (NN force)) (PP (IN of) (NP (CD 29)))))))))) (. .)))
Wachter works for the University of Pennsylvania. 
( Wachter ( ( works ( for ( ( the University ) ( of Pennsylvania ) ) ) ) . ) )
(ROOT (S (NP (NNP Wachter)) (VP (VBZ works) (PP (IN for) (NP (NP (DT the) (NNP University)) (PP (IN of) (NP (NNP Pennsylvania)))))) (. .)))