Lower interest rates will make this fund's high yield more attractive to investors.With interest rates starting to come down following the Federal Reserve's decision to cut rates, now could be a great time to consider investing some extra cash in the Vanguard High Dividend Yield ETF (VYM 0.17%).This Vanguard fund holds positions in over 500 stocks, many of which are in the S&P 500, but pay yields significantly higher than the index average of 1.14%. The prospects for lower interest rates should make this fu ...