The Fed is draining liquidity from markets for longer than expected. Here’s why it’s making Wall Street nervous.

U.S. stock futures were heading higher early Monday, building on the record highs reached last week. Dow Jones Industrial Average futures added 50 points, or 0.1%. S&P 500 futures were gaining 0.2% and Nasdaq 100 futures increased 0.

U.S. stocks are rising Thursday after the Federal Reserve cut interest rates for a second straight time, just as investors had expected.