The S&P 500 enters the new week under immense pressure after falling nearly 1% on Friday to hover near four-month lows. Despite a brief mid-week bounce on hopes of a diplomatic resolution, the market is bracing for a potential “Apocalypse Now” scenario, according to Ed Yardeni, as a critical geopolitical deadline looms.

The Polygon-based (CRYPTO: POL) Polymarket crowd has turned sharply bearish heading into Monday's open. The “S&P 500 Opens Up or Down on March 23?” odds currently show just a 30% chance of an “Up” open. Early trading volume for the Monday bet has surged to $132,516.

Why That Number Matters

The primary driver is a dramatic escalation in rhetoric from the White House. On Saturday evening, President Donald Trump issued a 48-hour ultimatum for Iran to reopen the Strait of Hormuz, warning that the U.S. would “obliterate” Iranian power plants if they fail to comply by 7:44 PM ET on Monday.

Highlighting this ultimatum, Yardeni said, “So Apocalypse Now might or might not happen at 7:44 pm EST on Monday.”

Trump's ultimatum to Iran.

The stakes for the global economy are historic:

Energy Shock: Brent crude has hit $107.86 per barrel, up 48.8% since the war began.

Infrastructure Attacks: Recent strikes have knocked out 17% of Qatar's LNG export capacity, threatening energy supplies to Europe and Asia.

Fed Hawkishness: Surging energy prices have flipped the script on interest rates. Markets now price in a 48.4% probability of a Fed rate hike by October, a total reversal from earlier expectations of cuts.

The Bear Countercase

The broader market is bleeding like it’s 2022, with energy being the only winning sector. The Invesco S&P 500 Equal Weight ETF (NYSE:RSP) is down 6.23% month-to-date, signaling that the average stock is suffering far more than the cap-weighted index suggests. Rate-sensitive sectors such as State Street Utilities Select Sector SPDR ETF (NYSE:XLU) and State Street Real Estate Select Sector SPDR ETF (NYSE:XLRE) fell more than 3% on Friday as the 10-year Treasury yield rose to 4.41%.

How The Previous Bet Played Out: The S&P 500 opened Friday at 6,594.66, below the previous close. While traders were bullish about Friday's open with ‘Up’ odds in the last two hours before the opening bell, the index ultimately opened lower.

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