E-textbooks can cost half the price of a new print textbook.

VOA: special.2009.09.03

It's kind of like the average price of a share adjusted for splits because you don't want the--obviously when they do a two-for-one split, the price falls in half and that's meaningless, so you want to correct for splits.

有点像经过分割调整的股票平均价格,因为你不想,当一股分割成两股,价格下跌一半,这是没意义的,所以要修正分割

耶鲁公开课 - 金融市场课程节选