[rgbrenner]

It also says this though:

American advertising revenues will rise from 1% of GDP today, to as much as 1.8% of GDP by 2027—a massive jump. Since 1980 the average has been 1.3%

So here we are at 1%.. and the historical average is 1.3%... Can you be in a bubble, if it's currently below the historical average?

If anything, I would say this is evidence that we are NOT in a bubble.

The rest of that article is just speculation, based on growth that we may or may not see.