One report on Wednesday could decide which way stocks break. JPMorgan thinks the May inflation numbers carry more risk than usual.
The danger is not even. A bad number hurts more than a good one helps.
Investors will skip the headline number. They will zero in on "core" inflation instead.
The consumer price index tracks what everyday stuff costs. Core just leaves out food and gas.
Those are the parts that bounce around the most. What is left shows the real trend.
And that trend has gone up three months straight. That breaks the calm story.
Many hoped the war's price spike would fade fast. The new data says it has not.
Three rises in a row is a pattern, not a blip. That is what has the bank worried.
Headline inflation is high too. The oil spike keeps lifting gas and power bills.
JPMorgan also pointed to last week's nerves. Traders had already cut risk, and that makes any surprise hit harder.
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JPMorgan mapped out how stocks might react. These are odds, not promises.
Most likely, core prices rise 0.25% to 0.3% on the month.
In that case, the S&P 500 barely moves. It lands between down 0.5% and up 0.75%.
A hot reading is the real threat. If core tops 0.35%, the bank sees the S&P 500 fall 2% to 3%.
A cool reading would be a relief. Come in at 0.2% or less, and stocks could jump 1.5% to 2%.
Either tail would be a big one-day move. That is why this report matters.
Notice the math is not even. The down move is bigger than the up move.
Stocks are also extra touchy about bond yields now. A hot number could push yields up and drag stocks down.
JPMorgan put it plainly. It called this a "good news is good news and bad news is bad news" report.
Think of a test where a wrong answer costs more than a right one earns. A 3% drop would not be a full stock market correction.
But it would still sting.
Inflation drives what the Fed does with rates. Hotter prices make rate cuts less likely.
Higher rates tend to weigh on stocks. So a hot report could sting in two ways at once.
The report covers May, but it sets the mood for June. Traders will trade the surprise, not the forecast.
Wall Street expects a 0.3% core rise. That sits right in the calm zone.
A number near that should keep things quiet. The surprise, either way, is what moves money.
Wednesday morning, one decimal point does the talking.
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