dollars_3094530bThe US dollar has surged to a four-year high against a basket of currencies and has punched through key technical resistance, marking a crucial turning point for the global financial system. The so-called dollar index, watched closely by traders, has finally broken above its 30-year downtrend line as the US economy powers ahead and the Federal Reserve prepares to tighten monetary policy. The index – a mix of six major currencies – hit 87.4 on Monday, rising above the key level of 87. This reflects the plunge in the Japanese yen since the Bank of Japan launched a fresh round of quantitative easing last week. More