This is simply not true especially if you take inflation into account.
And even more so if you look outside the US (one of the top 1% of market performers over the last 100 years - hindsight bias).
For example Japan total return index had a 30 year drawdown post 1989 even in nominal terms. The US market from 1966-1992 total inflation adjusted return (26 years) was zero. http://www.simplestockinvesting.com/SP500-historical-real-to...