Oil’s biggest slump in four years will lose momentum because the plunge in Chinese equities and Greece’s economic crisis won’t dent global demand, according to Morgan Stanley, UBS Group AG and Societe Generale SA. Crude is set for a “modest recovery” after declining 13 percent in the five sessions through Wednesday, Morgan Stanley estimates, while demand will push prices up by year-end, according to hedge fund manager Andrew J. Hall. Any nuclear deal with Iran won’t quickly revive the OPEC member’s crude exports, so wouldn’t immediately weigh on prices, Societe Generale said.