The reasons for it are that factor market is imperfect and that the legitimate rights and interests of peasant-laborers are not safeguard which are caused by unsound legal systems.

• 它是长期以来我国农民工劳动力要素价格扭曲的结果，其背后的深层次原因，既有要素市场发育不完善的因素，也有制度不健全造成农民工权益缺失的原因。