Marc Lasry, co-founder of Avenue Capital Group and billionaire, said that the uncertainty of Donald Trump's policies, especially the tariff policy, is hindering investors who want to take advantage of market opportunities. "When the market doesn't know what to do, that's a problem," the 65-year-old Lasry said at a credit opportunity seminar at New York University on Friday. "In such a situation, an economy cannot escape, which will only slow everything down and may lead to an economic recession."