American markets were closed for Thanksgiving. Today, the session will be shorter, ending at 18:00 GMT. Today is called Black Friday, which marks the official start of the shopping season, which coincides with the most profitable period of retail chains. In recent years, with the expansion of online sales the importance of Black Friday has been losing some importance for Cyber Monday. Purchases during this period are monitored almost daily by analysts (with higher incidence at weekends, when consumers are more affluent to the stores) and are well publicized in the financial media, and thus condition the performance of stock markets . For the shopping season as a whole, sales are expected to grow 3.60% over the same period in 2015. At the statistical level, since 1928, the S & P has appreciated 68% of Black Friday sessions, presenting a little average rise Lower than 0.27%.