The paper point out the fact that the real market is one with imperfect information,since col- lection of information will take energy, time, and money. It will take evaluator a great amount of cost to get the perfect information.

• 并指出现实市场是一个信息不完美的市场，由于信息收集要付出成本，估价师获得完美信息要付出很大代价。