Mystery Theme #6 by PolinskyL

Question 1

Picking up from my previous Mystery Theme, two significant flaws of the Dow Jones Industrial Average are its small number of constituents and the fact that it is price-weighted. Because of this, those in the industry tend to gravitate to a different index of large-cap stocks as the primary indicator of the health of 'the market'. This index is capitalization-weighted and contains HOW MANY companies? (Coincidentally, the same joint venture, co-owned by McGraw-Hill Financial, CME Group, and News Corp, determines the makeup of both this index and the DJIA.)

500 (S&P 500)