[deoptimo]

0. When many of the world's resources will be depleted in a multi-decade timeframe, there is a problem. I want humanity to last millions of years.

1. Fortunately, longer schooling and birth control has reduced the rate of growth in the model of Malthus. This is dumb luck, not divination from GDP.

2. Please remember that we won WWII and went to the moon in the periods with highest marginal tax rates. Growth is probably highest with higher rates of taxation and government investment in R&D.