The Federal Reserve expressed its confidence in a gradual return to sustainable economic growths as its fiscal policy instruments continue to work their way into the US economy.Furthering this, the Fed confirmed that it will aim to restore confidence in and stability through its previously announced asset purchase programme, although it confirmed that it will slow the rate of buying activity in mortgage-backed securities, agency debt and Treasury securities.The confirmation that its target rate for interest rates would remain low for an extended period also promoted buying activity in higher-yielding, commodity-linked currencies such as the loonie and Australian and New Zealand dollars, while the US dollar fell after the announcement.Speaking to Reuters, Kazuyuki Kato, treasury department manager at Mizuho Trust & Banking, explained: "The Fed move basically did not have enough impact to alter the market trend of funds flowing into riskier assets." Stocks, oil and other commodities also moved upwards after the announcement as traders looked to sate this stronger appetite for risk.