Archive shelves of architectural drawings, binders, and rolled maps in warm library light.

Data

Methodology

Primary sources first. Independent corroboration where it is actually independent. No invented global medians.

Tier 1: national statistical agencies, housing ministries, central banks, census organizations, official datasets.

Tier 2: universities, peer-reviewed work, housing research institutes.

Tier 3: reputable journalism, used to identify developments and then traced back to the original dataset whenever possible.

Research methodology