Buy and hold

Definition

Buy and hold acquires an instrument and holds it across market cycles, accepting interim drawdowns in exchange for the asset’s long-run return, minimal friction, and deferred taxation. It is the benchmark every active strategy must beat after costs — and on this platform it is treated as a strategy with parameters, not a default.

How it works / structure

• Legs: long shares (single name or fund), no exit rule tied to price.
• Parameters (engine-executable): instrument, entry rule (lump or scheduled tranches — mgmt-scaling), holding horizon, dividend treatment (reinvest vs collect), and an explicit thesis- break condition if any (a fundamentals-based exit converts it to a managed position).
• Return sources: price appreciation + dividends; for funds, minus expense drag (instrument-etf).
• Friction profile: near-zero turnover — the strategy’s structural advantage (ms-slippage-friction applies once per side; taxation defers until sale, acct-account-types).

When it applies

Long-horizon appreciation theses where the holder accepts the full drawdown path; index exposure as a portfolio core (port-allocation-frameworks); single names only with the diversification caveat below.

Risk profile & failure modes

• Full drawdown participation: history includes multi-year index drawdowns beyond 50%; the strategy’s premise is surviving them without selling — a behavioral requirement (bias-loss-aversion), not just a financial one.
• Single-name skew: Bessembinder (2018) found most individual US stocks underperformed Treasury bills over their lifetimes — aggregate market returns came from a small minority of big winners; undiversified buy-and-hold carries severe name-selection risk.
• No exit means no exit: a deteriorating single-name thesis held “for the long run” is drift, not discipline (qualitative-analysis event-falsifier rule applies).

Evidence & limits

The historical US equity premium (Mehra-Prescott 1985) is the strategy’s engine; it is historical, not promised. Barber and Odean (2000) documented that high-turnover retail accounts underperformed buy-and-hold benchmarks by several points annually after costs — the canonical evidence for the low-friction advantage. Bessembinder (2018) bounds the single-name version: concentration converts the equity premium into a lottery-shaped outcome distribution.

Falsifiable-thesis examples

Illustrations only, not signals:

• “X held for the next 3 years will outperform the 3-year Treasury yield at horizon” — falsified at the horizon mark.
• “A buy-and-hold position in index ETF Y will experience a peak-to-trough drawdown under 25% over the next two years” — falsified by the drawdown series.

Cross-references

• Income variant: strategy-dividend-income; systematic variant: strategy-factor-investing
• Portfolio context: port-allocation-frameworks, port-rebalancing, port-diversification-math
• Behavioral load: bias-loss-aversion, bias-recency
• Tax mechanics: acct-account-types, acct-wash-sale