But Jeremy Siegel, a respected professor from the University of Pennsylvania, has launched a rival index series under the WisdomTree brand that weights stocks solely on their dividends.

但是，宾州大学著名教授杰瑞米·席格尔(Jeremy Siegel)在智慧树(WisdomTree)商标发起了一个竞争的指数系列，它们单单以股票的红利作为权重。

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"If you write a call on your IBM shares, you reduce both risk and potential return, one for one, " says Bob Whaley, a Vanderbilt University professor who in 1993 developed the Chicago Board Options Exchange Market Volatility Index, or VIX, which tracks investor expectations for market volatility.

WSJ: Upside: Options for Nervous Investors