He writes
> When we were foragers, food was scarce. During the agrarian age, it was land. Following the industrial revolution, capital became scarce.
I don't really see how they are equivalent. Or actually I do they how they are equivalent but not in the way he writes.
For tribal chiefs, food probably wasn't scarce. For kings and lords, land was not scarce. For industrialists, capital was not scarce.
Wealthy people haven't just started doing strange things with capital as though they hadn't in the past with capital or land or food. Food wastage was a point of pride in elite society of the past, locking away vast amounts of productive land for private game parks, and investing wealth in all sorts of foolish ventures has been pretty common throughout history.
Yet all of those things were (and many still are) scarce for many people including in the US. So why do you say it's not, and what do you mean by "limits" of society exactly?
If a person can't buy a car or an education or a computer or tools or time to practice a new skill, then they can't work (or have less opportunity to) or they can't increase their productivity as much. Or they can't afford to have or put as much time and money into their children, which further limits society in the longer term.
I'm no collectivist, anti-capitalist, or social justice activist, I think inequality will always be here and it's our curse and our blessing. But surely we can't say capital is not scarce or doesn't matter so long as a significant number of people are limited by their own lack of it. Limited not just in entertainment and frivolous things but constructive wealth creating activities. Have I completely misunderstood the whole thing?