Robert Kiyosaki told his followers in an email on Sunday that investors should buy cryptocurrencies before they ruin the financial system.

The "Rich Dad Poor Dad" author told subscribers to the "Rich Dad Community" mailing list that he predicted the biggest crash in world history.

Kiyosaki still believes that bear markets are the best times for investors to make money. He said the US dollar would crash the existing economic system and lead to mainstream acceptance of digital currency.

He said that it wasn't enough to want to get into the digital currency. Before the biggest economic crash in history, now is the time you need to get into the world of digital coins.

The most popular coin was dismissed as worthless by Kiyosaki on his radio show. I am a trader of bitcoins." I don't think it's worth anything. I don't pay attention to what's happening in the game.

Digital coins have fallen along with stocks and other risk assets this year, suggesting many fans aren't convinced they will change global finance.

Kiyosaki warned of a bubble in asset prices that would end in pain. He said on August 30 that the crash was about to start.

In June, the doomsayer gave some offbeat advice for investors. He said to stock canned goods such as tuna and baked beans and household goods such as trash bags and toilet paper.

A young stock trader made over a million dollars in two years. He looks for five criteria in a stock, how he finds his trades, and the key strategy he sticks to.