Types of trading (the taxonomy)

Definition

“What type of trading is this?” decomposes into four independent axes, and most confusion about trading types comes from mixing them: HOLDING PERIOD (scalping → day trading → swing → position → buy-and-hold), DECISION METHOD (discretionary vs systematic), ECONOMIC ROLE (speculation, hedging, arbitrage, income/carry), and MANAGEMENT POSTURE (active vs passive). Every strategy in the KB is a point in this four-axis space — a covered-call program is income-role, typically discretionary, position-length, active; a CTA is speculation-role, systematic, swing-to-position, active. The taxonomy exists so the engine and its users name what a strategy IS before arguing about whether it works.

How it works / structure

• Holding period (the regulatory axis): SCALPING (seconds-minutes, spread/liquidity games — the tier where inst-hft-behavior competition is decisive); DAY TRADING (intraday flat by close — SEC-defined, acct-pdt-rule regulated, strategy-day-trading-styles carries the craft); SWING (days-weeks — strategy-swing-trading); POSITION (weeks-months — most fundamental theses); BUY-AND-HOLD (years — strategy-buy-and-hold); documented economics shift along the axis: costs and speed-competition dominate short horizons, thesis quality and patience dominate long ones.
• Decision method: DISCRETIONARY (human judgment per trade, playbook-guided — disc-playbook-setups) vs SYSTEMATIC (rules execute, humans design — quant-backtest-hygiene governs the design); hybrids are the practical norm; the documented trade-off — systematic scales and removes emotion but adapts slowly; discretionary adapts fast and imports every bias in Pillar 13.
• Economic role (who pays whom): SPECULATION (paid for carrying risk others shed — directional and relative-value); HEDGING (paying to shed risk — strategy-collar, strategy-tail-hedging); ARBITRAGE (enforcing price consistency — strategy-box-spread, index basis); INCOME/CARRY (harvesting premia — strategy-covered-call, strategy-futures-carry); role determines the honest benchmark: a hedge is graded on portfolio outcomes, not standalone P&L.
• Management posture: ACTIVE (any of the above) vs PASSIVE (style-passive-indexing — owning the market at minimum cost); the documented arithmetic (Sharpe’s zero-sum argument) sets the burden of proof active choices carry.

When it applies

Strategy classification before evaluation (the axes determine which evidence standards, costs, and regulations bind); plan writing (disc-trading-plan requires declaring the axes — most plan failures are undeclared axis mixing, e.g. a swing entry becoming an involuntary position hold); capital allocation across types (the axes are risk buckets with different capacity, cost, and skill profiles).

Risk profile & failure modes

• Axis drift (the classic failure): a losing day trade held overnight “as a swing” is not a type change — it is a stop violation wearing taxonomy; type declarations bind at ENTRY (bias-disposition-effect machinery).
• Horizon-cost mismatch: short-horizon trading pays costs per round trip that long-horizon theses amortize — the documented reason most retail day-trading cohorts lose net of costs (cited in strategy-day-trading-styles); type choice IS cost structure choice.
• Role confusion: hedges graded as profit centers get removed exactly when needed (strategy-tail-hedging’s documented abandonment cycle); income strategies graded as risk-free get sized into ruin (strategy-wheel caveats).
• Method myths: neither method is superior per se — the documented evidence: systematic wins where discipline and breadth dominate, discretionary where regime nuance and scarce data dominate; the failure is claiming one’s virtues while practicing the other’s vices.

Evidence & limits

Regulatory definitions (SEC/FINRA day-trading rules) anchor the holding-period axis; the cost and performance evidence per type is carried in the referenced entries; the axes themselves are an organizing convention (labeled as such) chosen for decomposability, not a discovered law.

Falsifiable-thesis examples

Illustrations only, not signals:

• “Trades that violated their declared holding-period axis underperform axis-compliant trades in the same account over 100+ trades (drift-cost check)” — falsified by the tagged-journal comparison.
• “Strategy X, reclassified from discretionary to systematic execution, retains its edge net of the rule-approximation loss (method-transfer thesis)” — falsified by the paired live records.

Cross-references

• The holding-period entries: strategy-day-trading-styles, strategy-swing-trading, strategy-buy-and-hold
• The posture pole: style-passive-indexing; the method disciplines: disc-playbook-setups, quant-backtest-hygiene
• The binding document: disc-trading-plan