Bill Ackman warns of ‘economic nuclear winter,’ urges 90-day timeout on tariffs - MarketWatch
1. Bill Ackman urges a '90-day timeout' on new tariffs. 2. Tariffs may induce an 'economic nuclear winter', impacting business investment. 3. S&P 500 futures fell sharply amid fears of a bear market. 4. Trump's 10% tariffs discount future cooperation with allies, posing risks. 5. Future negotiations could stabilize or worsen market conditions.