𧬠Methodology
The structural score aggregates 14 structural indicators drawn from Todd, Turchin, Case & Deaton and Putnam (fertility, infant mortality, births to foreign-born parents, single-parent families, drug overdoses, male suicide, alcohol deaths, M/W education gap, elite overproduction, housing, top 1% income share, household debt, secularization, social trust). Automated from FRED, CDC WONDER, Census and BLS; secularization, social trust and top 1% income share updated manually (once a year). No invented numbers.