The dollar has firmed up amid a risk-wary sentiment in global markets, which has seen world equity markets settle lower from record highs. At the same time, market conditions have been thinned by the lunar new year holidays in China and some other Asian nations. The DXY dollar index, after tumbling in three of the last four days, found a footing and lifted to a three-day high at 90.67. The index has been trading without sustained direction for nearly two months now, having recovered out of the 35-month low that was seen in early January at 89.21.