Our ability to produce material goods (even in the supposedly hollowed out US manufacturing sector) really is greater than at any time in history. We aren't crashing into any growth limit when it comes to infrastructure.
The problem is that taxes have been cut and costs like pensions have gone up (both in absolute terms from things like favorable contracts and life expectancy and in relative terms because of the tax cuts).
The problem is that taxes have been cut and costs like pensions have gone up (both in absolute terms from things like favorable contracts and life expectancy and in relative terms because of the tax cuts).