Before the opening of the session in the US sentiment in the environment definitely improved and the increase in the valuation of the German DAX slightly exceeded 1%. Afternoon trading phase brings also a strong increase in the oil market. Quotations on Wall Street started with anticipated increases (+ 0.41%), which means comeback to Friday's levels. These factors have been spotted on the Warsaw Stock Exchange and an hour before the end of trading, the Warsaw WIG20 index gained almost one percent and stood at 1,768 points.