Van Eck Global filed with the Securities and Exchange Commission to launch an exchange-traded fund focused on high-yield corporate bonds. The ETF would short U.S. Treasurys to hedge against a sharp increase in interest rates. The Market Vectors High Yield/Treasury Bond ETF would be linked to a proprietary index tracking below-investment-grade corporate debt, which must have a fixed coupon and one year left to maturity and be denominated in the U.S. dollar.