It's not unusual for an issue to become a public truth, simply because so many people state it so often, but for us to then find out that it might be public but it's not a truth. The interesting thing is how may people then follow Keynes and change their minds because the facts do?

Not all that many is our own observation:

The "buy-to-leave" phenomenon in housing has come into question after a report commissioned by the Mayor of London found that almost no homes in London owned by overseas buyers are being left empty.

The research, by the London School of Economics, found that "there was almost no evidence of units being left entirely empty - certainly less than 1pc".

Foreign buyers are indeed purchasing properties in one of the great global cities. But they're not leaving them empty, they're either using them or renting them out. Thus the entire idea of said foreigners hoarding those scarce London dwellings seems to be false.

Sadly, we don't expect any of the campaigners to change their minds. that's not how politics works, is it, it's not an evidence based process?

Which is, of course, why politics is a markedly bad manner of managing lie except for those issues which can only be solved by politics. Far better to leave everyone alone and let them get on with it, eh? Given that politics isn't based upon either evidence nor logic, neither being useful attributes in a management system.