The most common objection to bitcoin in investment conversations is risk. Bitcoin is volatile, the argument goes – “clients can’t handle -80% drawdowns.” That’s fair. Bitcoin HAS had -80% drawdowns. That’s real. But the follow-up question rarely gets asked: “What’s the risk of NOT holding it?”
That’s the honest problem with how most people calculate bitcoin risk: they only look at bitcoin volatility, not at the volatility of their alternative holdings or, worse, the deterioration of their cash savings.
The Actual Risk of Holding Cash
The US Federal Reserve’s M2 measure (money in circulation plus deposit accounts) was roughly $287 billion in 1970. By 2008 it was around $8 trillion. By 2024 it’s $21.5 trillion. That’s a 75x increase in 54 years.
The annualized growth rate of M2 has been roughly 12.8% per year over the past 20 years. This matters because it sets the baseline inflation rate in the economy. When money supply grows faster than actual economic output, the value of each unit of money declines.
Here’s the calculation nobody does: if you hold $100,000 in a savings account earning 1% real interest (after accounting for inflation), and M2 is expanding at 12.8% annually, your real purchasing power is declining at roughly 11.8% per year. In under six years, that $100,000 is worth $50,000 in real terms.
Compare that to bitcoin: over any rolling 4-year period in bitcoin’s 15-year history, holders have made money. Never lost money over a 4-year period. Meanwhile, cash savings are quietly losing half their value to monetary inflation.
The financial advisor is right that -80% drawdowns are scary. But she’s wrong if she thinks that’s too risky compared to the slow certainty of cash depreciation. One is a short-term drawdown. The other is a permanent loss of purchasing power.
Modern Portfolio Theory Breaks Down With Bitcoin
Traditional portfolio construction uses Modern Portfolio Theory (MPT), developed by Harry Markowitz. The basic idea: combine assets with different return characteristics to reduce overall portfolio volatility. The math assumes returns are normally distributed and past correlations predict future ones.
Bitcoin breaks these assumptions. Its supply is fixed. No amount of demand can increase the supply. This is fundamentally different from every traditional asset class-stocks can issue more shares, bonds can issue more debt, real estate production can increase. But Bitcoin’s supply stops at 21 million coins, forever.
When an asset has fundamentally different supply properties, the standard MPT math doesn’t apply the same way. Saifedean Ammous called this out in The Bitcoin Standard: assets with perfectly inelastic supply attract capital looking for the ultimate store of value. That capital flow continues until the price equilibrates to people’s confidence that the supply truly is fixed.
This is why historical correlations don’t predict bitcoin’s future behavior. Bitcoin isn’t correlated to stocks the way bonds are correlated to stocks because bitcoin serves a different economic function. Stocks pay dividends. Bonds pay interest. Bitcoin is a monetary network. Its value is derived from belief that it will be useful as money and store of value in the future.
This isn’t a flaw. This is actually the advantage. An asset that doesn’t behave like your other assets is precisely what you want in a portfolio.
What The Research Actually Shows
Fidelity Digital Assets ran the numbers on portfolio composition. They tested adding bitcoin to a traditional 60/40 portfolio (60% stocks, 40% bonds) with various allocation sizes.
The result: a 60/40 portfolio with 1% bitcoin allocation outperformed a pure 60/40 portfolio on risk-adjusted returns (Sharpe ratio). Not by a huge amount, but measurably. The 1% bitcoin position didn’t just add risk-it improved the portfolio’s overall efficiency.
This is the opposite of what risk-averse portfolio managers expect. They assume adding a volatile asset makes a portfolio riskier. But when the volatile asset is uncorrelated with your existing holdings, it actually reduces overall portfolio risk while potentially increasing returns.
Rolling 4-year return data for bitcoin: every single investor who bought bitcoin any time in the past and held for 4 years made money. Some bought at the top before crashes and still made money over 4 years. That’s a remarkable track record for an asset people call too risky.
The Asymmetric Risk/Reward Setup
Here’s the honest risk calculation: bitcoin could go to zero. It’s technically possible. The network could be compromised. People could lose faith in it. The probability is low-the network has never been successfully attacked in 15 years-but it’s not zero.
On the other hand: if bitcoin continues to be the best monetary network that can’t be debased by governments, if institutions continue to adopt it, if sovereigns continue to consider it for treasury reserves, the upside is orders of magnitude larger than the downside.
Compare that to your savings account: the downside is slow value destruction (you know it’s happening), and the upside is barely beating inflation (if you’re lucky). The risk/reward is symmetrical and bad.
Bitcoin’s risk/reward is asymmetrical and good. The downside is limited (you lose your allocation). The upside is potentially large (price appreciation, inflation protection, or both).
The Psychological Risk Is Real
Here’s where I’ll concede the financial advisor’s point: most people cannot psychologically handle -80% drawdowns. They see their $10,000 allocation drop to $2,000 and they sell. They crystallize the loss. They miss the recovery.
This is actually a bigger risk factor than the volatility itself. The investor who sells at the bottom and goes back to 100% cash has realized the loss. The investor who holds through the bottom gets the recovery.
This is why I recommend a specific allocation strategy: determine what percentage of your portfolio you can truly afford to hold through a -80% drawdown without selling. For most people, that’s 1-5%. You’re not betting your house on bitcoin. You’re allocating a small portion that you can psychologically hold through cycles.
But here’s the key: if you can hold that 1-5% for a full 4-year cycle, the historical evidence shows you’ll have made money. And your overall portfolio risk hasn’t materially increased-it’s actually decreased because of the diversification benefit.
The South African Risk Context
For South African investors, there’s an additional risk calculation: currency risk. The rand has lost approximately 70% of its value against the US dollar over the past 20 years. That’s a form of risk that most South Africans absorb passively-they don’t see it as a risk because it’s the baseline reality of holding local currency.
But it IS a risk. Your purchasing power in global terms is declining every year you hold rand-denominated savings. By this calculation, a South African holding 1-5% of their portfolio in bitcoin actually reduces overall risk because they’ve reduced exposure to rand depreciation.
Bitcoin isn’t correlated to the rand’s decline (bitcoin is priced globally). So a bitcoin allocation is a hedge against currency debasement. That’s particularly valuable in South Africa where real interest rates have often been negative-meaning your rand savings are losing value even after earning interest.
The Real Risk Calculation
The honest risk assessment is this: yes, bitcoin will have drawdowns. You might see -50%, -70%, even -80% from peak to trough. But you won’t realize those losses unless you sell. And if you hold through the cycle, history shows you’ll recover and go higher.
Meanwhile, holding 100% traditional assets in a depreciating currency with negative real rates of interest is also risky-it’s a slow, certain form of wealth erosion. Just because it’s familiar doesn’t make it less risky. It’s actually worse because you’re not even aware you’re taking the risk.
A properly sized bitcoin allocation (1-5% for most people) improves your portfolio’s overall risk characteristics because it gives you exposure to an asset that behaves differently from everything else you own. The volatility is real. But the benefit of that volatility-the uncorrelated upside-is larger.
The sceptics who say bitcoin is too risky are often the same people passively watching their real purchasing power erode year after year. The risk they’re taking is just less obvious.
