The United States a bubble?

Chart mavens would say yes. Nothing grows at this rate forever.

<img src="http://research.stlouisfed.org/fred2/data/GDP_Max_630_378.png">

 

Above chart would be VERY different if it were a logarithmic chart.

 

Why not? Among other things, longterm inflation keeps pushing up GDP.

What is the price of eggs now compared to 1909? What will it be in 30 years?

What was gold worth 50 years ago? What will it be worth in 30 years?

The GDP grows, as the value of the currencies declines.

 

Thats not a rate chart. Its total GDP. GDP will go up as long as the work force increases and or along with productivity.