Bitcoin has lost more than three-quarters of its value from a peak more than once. Roughly 83.2% in the 2017–18 downturn, around 75.2% across 2021–22 (measured on the PRIORAXIS price index) — and even in the calmer years since, its average fall from peak to bottom inside a single year has still run near 40% (industry market data; past numbers, not a forecast). Against a rollercoaster like that, picking “the right moment” to buy starts to feel less like investing and more like guessing.

So you stand on the sideline and wonder. When do you buy — now, or after the next dip? How much do you put in? And do you go all in at once — a lump sum — or feed it in slowly, a bit at a time? Everyone starts with these same three questions, and here’s the uncomfortable part: no social-media guru, no chart, and no gut feeling can hand you the answer.

The evidence is almost boringly clear

Start with what the numbers actually say, because they’re not shy about it. Put money into the market, leave it alone for five or ten years, and history has mostly rewarded those who waited. When researchers lined up investing a whole sum at once against feeding it in gradually, the lump sum usually won (Williams and Bacon, 1993). An investment firm running the same test across rolling ten-year windows up to 2011 found it won about two times in three (Vanguard, 2012 — the firm’s own research, so weighted lightly). The reason is dull and sturdy: over those stretches the market rose more often than it fell, so money sitting on the sidelines mostly missed the climb. One economist even proved on paper that a rigid buying schedule can’t be the best possible plan, because it ignores everything the market is doing (Constantinides, 1979).

So there’s the answer. Buy, hold, wait. Simple.

No one can say when it’s cheap, or how long to hold

Here’s the part no calculator prints. It can line up strategies against each other, but it cannot do the one thing the person actually wanted: say when the price is low, when it’s high, or how long to hold to come out in front. Nobody can. That information doesn’t exist ahead of time — if it did, the price would already reflect it.

And even the studies that do hand you an answer rest on a hidden assumption: that the money is left completely alone. The all-at-once winner holds on through the market’s worst case in those studies’ window — a fall of more than 80% in the early 1930s — without selling a thing; the spread-it-out plan keeps buying through the ugliest weeks without missing one. That isn’t what people do. We sell — because the market looks depressed and we want out, or because something shinier turns up and we’re sure we can do better elsewhere. The ugly weeks are exactly when we stop: the price drops, buying more feels insane, and the plan quietly gets shelved “until things settle.” That pause never appears in the numbers, and it decides more than the strategy does.

I know the pull first-hand. I sold my gold in 2001, certain I could put the money to better use. Its price today is around fifteen times what it was then. I wasn’t careless or unlucky — I did the completely ordinary thing, the same thing every one of those studies quietly assumes nobody does.

And there’s the real problem, sharpened to a point. The strategy that wins only wins if it’s never touched — and touching it, at exactly the wrong moment, is the one thing we can all be relied on to do.

Even the researchers who dug into the feelings behind these choices couldn’t agree on them. One argued the whole appeal of buying slowly is emotional, not financial (Statman, 1995). When others tested that, they split: one pair found the emotional story didn’t hold up (Leggio and Lien, 2001); another found the steadier approach genuinely felt better to someone who hates losing, even while earning a little less (Dichtl and Drobetz, 2011). And none of them looked at Bitcoin at all. One thing does shift the whole picture, though, and it’s worth saying plainly: how long the money is meant to stay invested. Over a long horizon, time does the heavy lifting; over a short one, none of this reasoning holds the same way.

What you can actually do about it

At this point you may realise that trying to find the perfect moment is mostly a trap. If you’re investing out of income — a bit each month — your buying is already spread across many different prices instead of riding on a single one. That isn’t a clever technique you have to learn; it’s simply what investing from a wage looks like. It won’t beat a perfectly timed lump sum on paper, and it was never going to. What it gives you is the thing that actually helps: not having to be right about the one thing nobody can be right about — the day.

Two habits make that work, and both cost nothing.

Decide your approach while you’re calm, and write it down somewhere you’ll see it later. A plan you invent halfway through a crash isn’t a plan — it’s a panic wearing a plan’s clothes.

Then keep a note of the times you don’t stick to it. Not to feel guilty — as information. The gap between what you meant to do and what you actually did is the one number that tells you something true about the kind of investor you are, and it’s the one almost nobody bothers to keep.

And be honest with yourself about time. These are assets whose big moves have tended to play out over years, not weeks. The one reading I’d stand behind from my own history — the gold I sold too soon — is that a short-term mindset and a long-cycle asset don’t sit well together. Knowing your own horizon before you start is what keeps the other two habits from quietly unravelling the first time the price lurches.