The explanation for this is marginalization, as seen in the pattern of innovation and subsequent colonization, following particularly productive inventions such as agriculture, that lead to differential expansion.
Such men, the economists argue, provided the "micro inventions necessary to make macro inventions highly productive and remunerative".
He calls cities "our species' greatest invention": proximity makes people more inventive, as bright minds feed off one another; more productive, as scale gives rise to finer degrees of specialisation; and kinder to the planet, as city-dwellers are more likely to go by foot, bus or train than the car-slaves of suburbia and the sticks.
But then I'm very productive again, I think, and full of inventions and strength.
But as traffic on America's roads increases every year, and the percentage of one's life spent in a vehicle grows ever longer, every invention that makes us safer, more productive or even just takes our mind off the frustration and epic tedium of inching forward through stop-and-go traffic is a welcome one.
As a result, Putin added, the government expects "serious return on its investment, [including] patents for inventions and the creation of small productive enterprises".
Rubens was one of the most assimilative, versatile, and productive of all Western artists, and his almost limitless resources of invention enabled him to become the master of the greatest studio organization in Europe since that of Raphael in Rome a century before.
Here's what Newt gets: First, immigration is a rejuvenation of our economy, a source of invention and investment at the high end and of tax-paying, productive labor at the low end.
Some enabling inventions may lie in the direction of turning retirees into productive citizens, so that the "aging" population becomes less of an economic threat.
