If the implication is that people who know economics (and aren't so old that they are out of their mind) have to vote Remain, my response is "OK".
He didn't have to, but there is a reason nearly all financial instutions (IFS, NIESR, CEP) professors (University College of London for example), banks, and even many (large) companies themselves actively warned against a brexit. Rarely have I seen so many experts agree on policy matters.