Secondly, although a lot of economists research effective competition on the basis of the theory of SCP, the weakness of the former researches is lack of effective competition indexes.

• 其次,虽然国内外学者以SCP为依托,对有效竞争进行了大量的研究,但大部分研究表明还没有一套完整的评价有效竞争的指标体系。