Reuters - The Chinese central bank's decision to double the currency's trading band is seen as a step towards financial liberalization. But its adding to investors worries about their exposure to China in the near-term, since many had bet on the yuan's one-way appreciation. Markets are already jittery over a bunch of factors including China's first domestic corporate bond default, a worrying fall in exports and anemic manufacturing data. We also get final 2013 earnings from China's biggest aluminum producer, Chalco. The Beijing-based company has already flagged a return to profit last year thanks to cost cutting and asset sales.