The claim that tariffs are negatively affecting the economy is true. The article quotes trustworthy and knowledgeable sources, such as the chairman of JP Morgan, who wrote a letter to shareholders. Here, he emphasizes the importance of healthy economic alliances and how America must do a better job promoting business overseas. https://www.jpmorganchase.com/ir/annual-report/2024/ar-ceo-letters
Checking this claim further, it seems several experts agree that tariffs are negatively affecting the economy. Jana Grittersova, an economist and professor, reports on the unintended consequences of tariffs. “First, higher import prices raise production costs for domestic firms, limiting the benefits of protectionist policies. Many U.S. companies, especially in the high-tech sector and manufacturing (e.g., iPhones use parts from 43 countries), rely on global supply chains. Tariffs also hurt American farmers, who export about 20% of their total output.” https://news.ucr.edu/articles/2025/03/24/economist-assesses-tariff-impacts-stock-market-trade
As well, Donald Trump's claims of tariffs being good for the United States is not founded in any evidence, not sourcing or verifying the information in his tweet saying, “ This is a great time to buy! Be Cool!” and “everything is going to work out well.” https://nationalpost.com/news/world/trump-says-be-cool-after-tariffs-the-usa-will-be-bigger-and-better-than-ever-before
Based on the information and sources, this claim is true.