S&P 500 index erased gains during Monday trade on news Greek parliament finally approved austerity plan to secure bailout funding. US benchmark jumped 0.68% or 9.13 points and settled at 1,351.77. Apple gained 1.9% after company said the working conditions at the plants of its suppliers have been investigated. First Solar fell 5%, after Brigantine Advisors downgraded its stock from buy to hold. AmerisourceBergen declined 3.6% after its CFO M. DiCandilo decided to quit.