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Foundationspractitionermarket-note

Prediction Market Probabilities

Interpret binary contract prices without treating them as certainty.

Reviewed 2026-08-10TheQuantBateman ResearchReading note
01Intuition

Begin with the executable market object.

A YES price resembles an implied probability, but liquidity, fees, risk preferences and market structure can separate it from a calibrated real-world forecast.

ONE-LINE DEFINITION

Interpret binary contract prices without treating them as certainty.

02Mathematics

Make the quote arithmetic explicit.

pimplied≈PYES,PYES+PNO≈1p_{implied}\approx P_{YES}, \quad P_{YES}+P_{NO}\approx 1
Notation and units

Decimal rates and volatilities, year-fraction time and continuous compounding unless stated otherwise.

03Assumptions

Record venue, timestamp, and convention.

01

The venue, timestamp, executable side and data status are part of every market observation.

02

Midpoints and derived probabilities are analytical coordinates, not guaranteed executable levels.

03

Licensing, freshness and resolution rules determine how the observation may be used.

“An unstated convention is a future reconciliation break.”— THEQUANTBATEMAN
04Market use

Distinguish observation from inference.

Macro event monitoring and scenario weighting with explicit semantic caveats.

Intuition→Mathematics→Implementation→Desk risk
05Desk view
FRONT OFFICE VIEW

Ask what can actually be traded or hedged.

Start from the executable side and timestamp. Derived Foundations signals are only as reliable as the market state and resolution convention beneath them.

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06Related

Inspect the connected market state.