Wednesday brought better times to the stock market, and major market benchmarks finished the day up around half a percent. Helping to move the S&P 500 and Dow higher was news from oil cartel OPEC that member nations had reached an accord to try to retake control of the energy market, and that led to extensive optimism among investors in oil producers as well as the physical commodity. The United States Oil Fund (NYSEMKT: USO) jumped almost 5%, outpacing the SPDR S&P 500‘s (NYSEMKT: SPY) 0.5% gain.