British finance minister George Osborne said a vote to leave the European Union would do permanent damage to the country's economy and could cost each household 4,300 pounds ($6,100) a year by 2030 Osborne said all the alternatives to remaining in the union would leave Britain's economy smaller than if it stayed in the world's biggest trading bloc "Put simply: over many years, are you better off or worse off if we leave the EU. The answer is: Britain world be worse off, permanently so," Osborne said