Investing, fast and slow

It seems to be a natural law that negatives happen fast while positives happen slowly and steadily. No unhealthy person gets healthy suddenly, but a lot of people lose good health suddenly. No one gets rich in a day, but many become poor overnight. Think of it this way. Can there be an event that causes the world's economic output to drop by some catastrophic amount, say 10 per cent, in just a year? Yes, definitely. Covid could have been such an event. However, can the opposite happen? Could something happen that could cause an equivalent boost in a year? No, absolutely not. The chances of such a miracle are as close to zero as possible. Also, this asymmetry is scale-dependent. Can an individual become wildly rich very quickly? Yes, it happens every day to some people around the world. Can the equivalent happen to a small business?