Iâve got a trading methodology that seems to work on US stocks. But I want to âdiversifyâ and apply this same methodology to a basket of foreign stocks. Backtesting shows that it should do better if anything. But hereâs my question: Iâve always read that foreign stock markets tend to be quite correlated to the US stock market. So is this really going to do me any good? Or, with the fall of the US dollar and the rise in economic power of Asia and the recent growth in Europe, are we seeing a decoupling of this phenomenon? In other words, is there any reason to believe that other stock markets around the world, particularly in Asia, Europe, the Caribbean and Brazil, can do well even if the SnP is trending down?