U.S. markets are poised to open with gains on Wednesday as bond yields slipped and oil prices fell.Futures for the S&P 500 rose 0.4 per cent while futures for the Dow Jones Industrial Average edged 0.2% higher and Nasdaq futures jumped 0.7 per cent.The yield on the 10-year Treasury eased overnight to 4.64 per cent from 4.66 per cent late Tuesday, but are up from less than four per cent before the war with Iran began. That’s a notable increase and part of the reason that stock prices look even more expensive while threatening to slow the economy.Higher yields can...