Earlier quoted context omitted.
> A lot of growing companies have US taxes that are quite low because they lose money for a long time while they're investing in growth. When they finally become profitable, they're allowed to roll forward those losses (within limits) to offset their profits. Human beings cannot do the equivalent. Spend the entirety of your 20s making very little money because you are investing in growth and then make $800k as an ort…
If you spent your 20s making money, little or no, you didn't have losses. If you spent your 20s conducting losing trades in the stock market, you accumulate capital gains losses that you can only apply $3,000 per year against your regular income. If at age 30 you made $800,000 in capital gains you are able to apply all those unused losses against those gains. So "human beings" aren't much different.
To some extent this is made up for with the standard deduction and various other deductions, but you can’t carry it forward if you made less than the standard deduction, even if you actually are spending more than you make.
The idea of carrying forward losses is unintuitive to most people because we mostly don’t get to do that.