The dollar has been trading with a firming bias, overall, posting fresh highs versus some currencies, such as the pound and Australian dollar, although so far remaining off highs seen yesterday against other currencies, such as the euro. The spate of cautious trading in world stock markets, due to concerns about the highly transmissible Delta variant’s spread in Asia and elsewhere, has revived some safe haven demand for the U.S. currency. Data out of Asia have been adding to the wary sentiment.