IVV: Buying the S&P 500 Without Commissions

Investors have plenty of ETF options to track major U.S. asset classes. The benchmarks sometimes have significant overlap, and in some cases more than one ETF follows the same index. How do you tell which one is better? One important factor is expenses. Take two ETFs designed to track the S&P 500. SPDR S&P 500 Index ETF (SPY) has an expense ratio of 0.09% as does its lesser known rival, the iShares S&P 500 Index ETF (IVV) . SPY, the original ETF, is more widely held than IVV. In fact, SPY is bigger than any other ETF in the world having…