US investors returned to their screens after the long Labor Day weekend, but instead of a routine, gradual restart, they faced a macroeconomic squall. Markets opened the week in a state of indecision, torn between fears of a fresh inflation wave, an oil shock, and rising expectations for tougher action from the Federal Reserve.

By Monday evening, the Dow Jones (industrial gauge) slipped by about 0.6% to roughly 53,116, the broad S&P 500 lost 0.1% to 7,712.25, while the tech-heavy Nasdaq 100 bucked the trend and edged up 0.3% to 29,639.75.

This nervousness was a natural continuation of Friday's sell-off: ahead of the holiday, Wall Street had already fallen on macro releases, with the Dow down 0.5%, the S&P 500 off 0.4%, and the NASDAQ Composite down 0.3%.

The key panic trigger was the August jobs report. US employers added 162,000 payrolls, a number that materially beat even the most optimistic economist forecasts, while the unemployment rate held at 4.1%. For Wall Street, what are good headlines for the economy translated into bad news for equities: an overheated labor market reduces the likelihood that the Fed will ease policy anytime soon.

Investors instantly repriced their bets. According to CME FedWatch, the probability of a 25?bp rate hike at the September 15–16 FOMC meeting jumped from 49% to 60%.

Major players began to revise forecasts urgently. UBS was among the latest global banks to flip its stance 180 degrees. Where it had previously priced in no rate hikes for 2026, the Swiss bank's base case now assumes a much tighter path: two increases, in September and December.

If payrolls data represents an internal challenge for the Fed, geopolitics is striking the most vulnerable spots in the global economy and fanning the inflationary fire.

Brent traded near $97/barrel on Tuesday amid a rapid escalation in the Middle East. The US–Iran confrontation is entering a new phase: after US strikes on Iranian vessels, Tehran threatened retaliatory attacks on regional energy infrastructure. Reports of strikes on a refinery in Jazan, Saudi Arabia, have added to the risk mix.

Markets are jittery over potential supply disruptions through the strategically vital Strait of Hormuz. Higher energy prices put the Fed in a difficult position: the central bank must decide whether the economy is resilient enough to tolerate tighter monetary policy while inflation is being pushed up from abroad by costly oil.

All eyes now turn to this week's macro calendar. Thursday brings the Producer Price Index (PPI), and Friday delivers the headline inflation reading — the Consumer Price Index (CPI).

Those prints will serve as the final arbiter in the hawk-vs-dove debate. They will determine whether the Fed moves forward with a market-painful rate hike next week or opts to pause, hoping the economy will weather the external inflation shock without further tightening.