The New York Stock Exchange was hovering around balance after opening Monday. The Dow Jones index was down 0.27%, the tech-dominated Nasdaq advanced 0.06%.

The broader S&P 500 index had reached its highest level since last August. The markets believe that "there is a 76% chance that rates will remain unchanged on the 14th", says Art Hogan of B. Riley Wealth Management. Apple is expected to unveil its first mixed reality headset — which mixes VR and augmented reality (AR) — at its annual developer conference.