MADRID | By J. J. Fdez-Figares (LINK) | European and American stock markets closed yesterday up in a session of low activity and  volatility. The good performance of Western stock markets ​​occurred despite the set of macroeconomic figures published during the day in China, Europe and the USA, which pointed again to a global slowdown in economic growth. The only explanation we can find to the good performance of stock markets yesterday is precisely that investors have interpreted that as long as the growth of these economies remain weak, the central banks will be forced to maintain its current policy of monetary expansion, which provide liquidity to the system, something that equity markets consider positive.