Affordable housing sits within Real Estate & Property Markets, the world's single largest store of household wealth, land included — a category whose own scale remains unverified (a commonly cited ~$379–380T global real estate value (Savills) could not be re-verified against the primary source). Affordable housing is one of 17 of the category's 20 items directly backed by institutional trackers — Nareit, OECD, FAO, Federal Reserve, US Census Bureau, UN-Habitat — rather than an editorial judgment call.
Affordable housing is 1 of 20 items in Real Estate & Property Markets. See the full ranked list, or browse all 20 Human Endeavors categories.