The Gaza corridor — ceasefire and escalation markets read across venues (Polymarket's book is typically deeper than Kalshi's here).
Composition changes from the daily reconstitution pass. The divisor keeps the published series continuous through every change.
What feeds the figure at last compute — market prices in cents, indicator values in their natural unit, and the component weight.
The Mensor reads the market; it does not take positions in it. MGRI-GAZA is a measurement, not a forecast and not a tradable product. Prediction-market prices are risk-neutral and approximate probabilities.