Can UK become the richest economy?

• Conservative Minister, Jo Johnson, brother of Boris, said the UK can never be the world's richest economy

Tory Chancellor George Osborne has claimed that Britain can become the world’s richest economy.  He said that within 15 years Britain could be richer than the USA and, “become the most prosperous of any major economy by the 2030s”.

But three years ago Jo Johnson, MP, author of the Tory's 2015 manifesto, told me Britain can never again be the world's richest economy.