[justaguyonline]

You took the post from right under by fingers.

The Rise and Fall of American Growth by Robert J. Gordon makes the exact same point but gets there via analysis of where Americans are spending money for food. Since the 70s we've more than doubled the fraction of our income we spend eating outside of the home.[1] This tracks with the rise in adult obesity in America and is a divergence from trends in other developed countries like France.

[1] Chapter 10