The U.S. dollar has never been stronger, by one measure. That could create problems for investors. - MarketWatch

1. The U.S. dollar is at historic highs, impacting global markets. 2. DXY index recently topped 110, highest since November 2022. 3. Rapid dollar appreciation affects corporate earnings, especially for S&P 500 sectors. 4. Emerging markets face challenges with a stronger dollar but are more resilient now. 5. U.S. economic strength and potential inflationary policies bolster dollar value.