The Federal Trade Commission on Tuesday issued long-awaited rules requiring companies to display the full price of a hotel room, concert ticket or sporting event up front to customers, rather than hiding any extra charges — often called “junk fees” — until the very end of the checkout process.The new regulations, which are slated to take effect next year, seek to crack down on “bait and switch” pricing practices, according to FTC Chair Lina Khan, who said the agency has received a groundswell of...