Taxi Affordability Index
A pilot indicator comparing a locally produced service across cities, then asking whether local people can afford it.
Indicators
Zerion Indicators
Structured measures designed to turn specific real-world frictions into comparable, source-linked views.
Methodology versions
Future indicators should disclose source dates, coverage limits, data-cleaning rules, and calculation versions.
Historical snapshots
The indicator architecture should preserve snapshots rather than overwrite older calculations without trace.