With a dividend yield of around 4.4%, the SPDR Portfolio S&P 500 High Dividend ETF (NYSEMKT: SPYD) lives up to its name. For comparison, the SPDR S&P 500 ETF Trust (NYSEMKT: SPY) has a yield of just about 1.3%. You need to understand how the high dividend ETF achieves a yield that's three times as