MADRID | Finance daily newspaper Expansion reported Tuesday that investment bank Goldman Sachs expects Santander and BBVA stock price to go up by 50 percent, according to an analysts’ note. The confidence of Goldman Sachs experts goes far beyond the two big Spanish banks, too. All medium-sized banks in Spain had their ratings updated with higher value, apart from Bankinter, whose share price was reduced to €2.70 or 10% lower than at Monday’s close. The punishment Spain’s banking…