Counterpoint: Galbraith confidently called the US stock market a "classic bubble" in April, 1999. At that time, the Dow Jones was at 10,494. Today it's at 24,504.
Looking back with 20/20 hindsight, it now looks like Galbraith was wrong.
Source: https://www.theguardian.com/business/1999/apr/18/observerbus...
> Assets need to be productive in order to be true investments
Counterpoint: Maybe assets need to be useful to have value. Land, copper, the balance on a Walmart gift card and my World of Warcraft gold don't produce anything, but they're useful, so they have value.