The Money Edit

Closing bell

Closing bell

S&P 500 7,636.36 0.5%
Brent crude above $100 a barrel 3.4%
10Y Treasury 4.85% highest since 2023
Dow Jones Industrial Average 0.8% to 52,380.66
Nasdaq composite 0.6% to 26,253.34
Russell 2000 1.3% to 2,921.23
National average gasoline $4.22 a gallon

Oil tops $100, stocks fall a third day

What happened

US stocks fell for a third straight session. The S&P 500 closed down 0.5% at 7,636.36, the Dow Jones Industrial Average lost 405 points or 0.8% to 52,380.66, and the Nasdaq composite slipped 0.6% to 26,253.34. Smaller companies took the worst of it, with the Russell 2000 down 1.3%, while Brent crude, the benchmark price for internationally traded oil, jumped 3.4% back above $100 a barrel for the first time since July.

Why it happened

The day started in the Persian Gulf, not on Wall Street. US and Iranian forces have been striking each other's tankers around the Strait of Hormuz, the narrow shipping lane that carries about one fifth of the world's oil in normal times, and traffic through it has collapsed to roughly ten commodity ships a day. Less oil reaching buyers means buyers bid against each other for what is available, which is why Brent crossed $100.

From there the chain runs through inflation. Oil is an input into almost everything, so when a barrel gets more expensive, the cost of fuel, shipping, plastics, and food rises a few weeks later. The Federal Reserve, the US central bank that sets short term interest rates, raises rates to cool inflation by making borrowing more expensive and slowing spending. Traders reacted by pricing in about a 60% chance of a rate increase this month, according to CME Group data cited by Yahoo Finance, a striking reversal from the rate cuts markets expected earlier this year.

That expectation showed up in the bond market. The 10-year Treasury yield, the interest rate the US government pays to borrow for a decade, rose about six basis points to roughly 4.85%, its highest since 2023. A basis point is one hundredth of a percentage point. Higher yields hurt stocks two ways. Bonds start paying enough to compete with stocks for investors' money, and a company's future profits are worth less in today's dollars when the safe alternative pays more, which hits fast growing companies and small companies that borrow heavily.

What it means for you

The pump is where you will feel this first. Gasoline is averaging around $4.22 a gallon nationally, a record for early September, and diesel has hit an all time high near $5.90, which matters even if you never buy diesel because it is what trucks burn to bring groceries to your store. Expect that to show up in food prices over the next month or two.

On borrowing, mortgage rates track the 10-year Treasury yield closely, so a yield at 4.85% means mortgage quotes are drifting up rather than down. If you were waiting for cheaper rates to buy or refinance, this week moved the wrong way. The flip side is real. Savings accounts, certificates of deposit, and money market funds pay more when yields rise, so cash on the sidelines is earning better than it did a month ago, and it is worth checking whether your bank has actually passed that along.

For a retirement account, a 0.5% down day is noise. The pattern worth noticing is different: for two years the story was when will the Fed cut, and this week the market started asking whether it will hike instead. That flip changes what works and what does not across stocks, bonds, and savings, so it is worth watching Thursday and Friday.

Sources