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According to the world's biggest investment manager, having 2% of your portfolio in bitcoin is a "reasonable" amount.

What does this mean?

BlackRock says allocating 1% to 2% of a balanced portfolio to bitcoin would give you a similar level of risk as investing in the Magnificent Seven's stocks. Any more, it warns, and the crypto could tilt your overall mix into a riskier spot than you'd intended. To be fair, it's not that risks are a bad thing: savvy investors simply prefer to spread theirs around. After all, in many cases, when stocks drop, bitcoin doesn't (since its "correlation" to that market tends to be low). That independence - or diversification - can help cushion a portfolio against drops. Similarly, bitcoin's rises might give your returns a boost, but you may see stomach-turning drops along the way: its price has plunged as much as 80% before.

The World Economic Forum estimates that retail investors - not big-time investing houses - hold 52% of the world's assets in their portfolios. So that's at least $67 trillion in your hands. Now let's say you all followed BlackRock's suggestion and allocated 2% to bitcoin - that's a combined $1.3 trillion. And let's say you opted to do so via BlackRock's bitcoin exchange-traded fund (ETF), which charges investors 0.25% a year. Well, that's some $3 billion in fees for the firm. It's not chump change: that's over 16% of what the fund giant made in revenue last year. And even if only some of you did it, BlackRock would still stand to make a mint. And that could explain why the asset management company, during a historic bitcoin rally, decided to make a public declaration of love for the OG crypto.