Analyst ratings and price targets can significantly influence a company's stock price. In this case, Societe Generale, a reputable financial institution, has initiated coverage on Schlumberger Limited with a Buy rating and a price target of $81. This suggests that they believe the company's stock is undervalued at its current price and has the potential to reach $81. This positive outlook could encourage investors to buy the stock, potentially driving up its price in the short term.