Earlier quoted context omitted.
The only reason we have enough is because of that economic system. Take a look at Venezuela. It ought to terrify everyone that so many take what we have for granted.
We shouldn't always point at obviously dysfunctional examples when we look at problems in our society. There is no natural law that things will always end up like Venezuela or the Soviet Union when we change things.
Until all the necessities are 100% automated there are only two options to motivate people to produce those necessities: through force, or through self-interest. The list above is where they tried force. Maybe it's not a natural law that such a system has so far always failed, but it's not a mystery either.