"Santa Claus" may disappoint? This week, the Federal Reserve's blackout period continues, and the focus of the market in December is on the performance of retail and cloud computing leaders.

According to the Wisdom Financial APP, the last month of the year will start on Monday. Investors hope that this month will end smoothly and draw a conclusion for the whole year. After experiencing a turbulent November trading, the Nasdaq Composite Index ended its seven-month upward trend, while the S&P 500 Index rebounded to a level just 1% below its historical high.