Note that the demographics (specifically, the aging of the Baby Boomers) point not only to future failure of Social Security and Medicare (to date no serious reform, long overdue, has been attempted for these; so many less intelligent people in this country remain in denial that they are unsustainable in their current forms), but to a large-scale asset sell-off and long-term broad bear market in future decades as people sell assets to finance their retirements.

There is no “population explosion” as the 1960s-onward hystericist little left-totalitarian-wannabees have often claimed, but in fact a remarkable reduction in fertility since the early 1960s all over the world (there are very few places where fertility remains high). In this sense there is a “population aging” or “global aging” (or “ageing” if you look up documents with the British spelling, such as at the United Nations) and aging in the developed nations will constrain economic growth (and compound the problems with retirement-related social-spending and -service programs there). The USA is in better shape (with higher fertility and population growth, albeit still modest) than Europe, at least. (Hopefully it won't be made as bad as Europe, as it could be if the childish little leftists who want democratic socialism for the USA just as in Europe have their way, as they are becoming able and even encouraged to do in Washington currently.)

Growth, and large growth, is not inevitable. The automobile market (currently hurting like others) in the USA, for example, has long been considered stable or “mature” (everyone who can drive pretty much has a vehicle to drive nowadays, for example).

Also, the intriguing example of fertility loss from agriculture (reminding me of many different subjects or issues) has other counterparts, including one involving arguably “too much growth.” Namely, there is the example about how people can wreck something (and yes, the lefties sounding the alarm about this were in fact proven correct, after all) of fisheries depletion, such as off the Canadian coast. Just ask all the fishermen in Newfoundland who are out of work. (The same is actually true in a way about man's increase in atmospheric carbon dioxide and eventual climate change, but the lefties have ruined this issue with their misbehavior and their misunderstanding when not being dishonest as well as insincere and immature — not one in ten thousand of those pathetic people actually understand the issue clearly and correctly.)