Among exchange-traded funds, the Nasdaq 100 tracker Invesco QQQ Trust (NASDAQ: QQQ) ticked higher at 0.36% Wednesday, while the SPDR S&P 500 ETF (NYSEARCA: SPY) is also up by 0.43%. Investors are finding temporary relief in assurances from the Federal Reserve Chair Jerome Powell that the central bank would step in to rein in rising prices. Today, the Bureau of Labor Statistics released its December Consumer Price Index (CPI) readings, giving investors a treasure trove of data to look through.