Among exchange-traded funds, the Nasdaq 100 tracker Invesco QQQ Trust (NASDAQ: QQQ) tumbled at 1.71% Monday, while the SPDR S&P 500 ETF (NYSEARCA: SPY) is also down by 1.28%. In fact, Goldman Sachs expects the Federal Reserve to hike interest rates from near-zero levels four times this year as unemployment drops and inflation continues to rise. There is an indication that some central bank officials are eyeing a quicker start to interest rate hikes and balance sheet runoff process than many market participants had expected.