An 89-year-old Japanese man made 2 billion yen trading stocks, about 84 million yuan.

An old post from 2017 recently resurfaced and went viral, with 2.1 million views. His method is incredibly simple—ten rules in all:

Down 5%: do nothing
Down 15%: add 10% to your position
Down 25%: add another 25%
Up 5% to 15%: hold, do nothing
Up 25%: sell 10%
Up 35%: sell 20%
Up 45%: sell 30%
Up 60%: sell 40%
Double: sell everything and walk away

No indicators, no insider information—just discipline.

Now look at us: down 5% and we panic-sell; up 30% and we think it’ll go to the moon; doubled our money and we still want another double. BTC is at $84,124, up 1.28% today. How many people are once again torn between chasing it and waiting?

The old man is still following this strategy at 89. It’s not because he’s clever, but because he wrote greed and fear out of the equation in advance.

My take: if you apply this to crypto, you need to widen the thresholds—the swings in crypto are several times bigger than in stocks. But the basic framework of selling in stages when prices rise and buying according to plan when they fall never goes out of style, in any market.

#BTC #Trading