Investors may take Janet Yellen’s expected endorsement of a market-driven exchange rate as an additional green light for the U.S. currency’s long-term downtrend. The U.S. Treasury Secretary-designate will affirm the U.S.’s commitment to a market-determined dollar value on Tuesday, the Wall Street Journal reported. The comments could fuel speculation authorities will not object to a softer greenback, which earlier this month fell to a two-year low against its major peers. Investors are already doubling down on wagers that stand to profit if the currency weakens further, emboldened by an incoming Democratic … (full story)