President Donald Trump's sharp tariff hikes last week have sent the stock market into a tailspin, raised alarm bells among Wall Street executives, and heightened many economists' worries that the U.S. could tip into recession. FRANCE 24's Sharon Gaffney speaks to Hilary Ingham, professor of Economics at Lancaster University. She says that markets don't like unpredictability and with "Donald Trump in the White House there's no predictability whatsoever".