To foster productivity (physical output per worker) and constrain supervisory costs, wages are paid on a piece-rate basis, providing incentives for rapid completion of the operation.
( ( To ( ( ( foster ( productivity ( -LRB- ( ( ( physical output ) ( per worker ) ) -RRB- ) ) ) ) and ) ( constrain ( supervisory costs ) ) ) ) ( , ( wages ( ( are ( ( ( paid ( on ( a ( piece-rate basis ) ) ) ) , ) ( ( providing incentives ) ( for ( ( rapid completion ) ( of ( the operation ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (S (VP (TO To) (VP (VP (VB foster) (NP (NP (NN productivity)) (PRN (-LRB- -LRB-) (NP (NP (JJ physical) (NN output)) (PP (IN per) (NP (NN worker)))) (-RRB- -RRB-)))) (CC and) (VP (VB constrain) (NP (JJ supervisory) (NNS costs)))))) (, ,) (NP (NNS wages)) (VP (VBP are) (VP (VBN paid) (PP (IN on) (NP (DT a) (JJ piece-rate) (NN basis))) (, ,) (S (VP (VBG providing) (NP (NNS incentives)) (PP (IN for) (NP (NP (JJ rapid) (NN completion)) (PP (IN of) (NP (DT the) (NN operation))))))))) (. .)))
The supervisory costs tend to be quite a lot.
( ( The ( supervisory costs ) ) ( ( tend ( to ( be ( quite ( a lot ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ supervisory) (NNS costs)) (VP (VBP tend) (S (VP (TO to) (VP (VB be) (NP (PDT quite) (DT a) (NN lot)))))) (. .)))