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"Dollar-cost averaging" is more ambiguous than it sounds. Every DCA plan fixes a number — but which number? The answer decides whether your cost curve runs against the trend or with it.
Two units, two opposite curves
- U-denominated DCA (fixed amount): buy $1,000 of BTC every month. You buy more coins when the price is low and fewer when it's high — your dollar cost is averaged down.
- Coin-denominated DCA (fixed quantity): buy 0.001 BTC every month. You spend less when prices are low and more when they're high — your fiat cost moves with the trend.
The counter-intuitive bit
In a one-way bull run from $30k to $80k, the same capital DCA'd with a fixed dollar amount returned about +62%, while fixing the coin quantity returned about +45% — because coin-denominated DCA forces you to spend the most precisely at the top. That's not a flaw of DCA; it's a flaw of using the wrong unit for the goal.
How to choose — a quick decision table
| Your situation | Use | Why |
|---|---|---|
| Salary / fiat income | U-denominated | Matches cash flow, auto-averages down |
| Mining / staking / airdrop income | Coin-denominated | Re-invest coin income directly |
| Goal = grow fiat value | U-denominated | Controllable cost, easy to take profit |
| Goal = "stack N coins" | Coin-denominated | Guarantees the target quantity |
| Bear market / dip | U-denominated (add) | Buys more automatically |
| Bull market / top | U-denominated (trim) | Avoids "paying more as it rises" |
The pragmatic answer: layer them. Keep a core position in U-denominated DCA (e.g. 80%) and a "conviction" slice in coin-denominated DCA (e.g. 20%) if you want the satisfaction of watching a fixed coin count climb. Switch to U-denominated — and trim — in bull markets; coin-denominated almost never belongs in a late-stage add.
DCA is about which number you fix: money or coins. Pick the one that matches what you're actually trying to accumulate.
