vitrine · corridor · pairwise
1900s ↔ 1940s
Fact families the measure guard certifies comparable for this pair. Everything else renders as the gap it is. Every value links to its record.
A new car — affordability
⚠ Share-of-income mixes income concepts across decades (family income (period cost-of-living survey), total money income); a step between points may reflect the concept change, not affordability.
⚠ Price and anchor years differ by more than 3 years in: 1900s, 1940s — the hours axis is not strictly inflation-free there.
1900s · Tier C
$650 (Oldsmobile Curved Dash, best-selling) to $750 (Ford Model A) ≈ 2,600 hours of work
1940s · Tier A
~$638 (average wholesale, computed from factory sales) ≈ 565 hours of work
Life expectancy at birth
years (all races, both sexes)
⚠ Decades before the 1960s published white-only male/female life tables with no all-races total — the placard carries the sexed figures and the chart renders the gap rather than a spliced concept.
1900s · Tier A
48.2 years (white male), 51.1 years (white female) — see the placard
1940s · Tier A
1939-41: 62.8 male, 67.3 female | 1949-51: 66.3 male, 72.0 female — see the placard
Homeownership
% of occupied housing units owner-occupied
Average family size
persons per family
⚠ The 1900s datum (5.31) is from the 1901 BLS wage-earner survey — 0.7 persons above the Census 1900 national average of 4.61; the survey over-sampled larger families, not by design.
⚠ The 1940s point is 1947 (first postwar CPS tabulation), not 1940. The 1960s uptick (3.7 vs 3.54 in 1950) reflects the baby boom's peak family-composition effect.
Household landline telephone
% of households
⚠ The 1900s source combines several technologies in one headline percentage, so its 5% is not plotted as a telephone datum.
⚠ 1910s–1930s sources counted telephones per 1,000 population, not households — those decades render as gaps rather than a unit splice.
1900s · Tier A
Telephone: 9.2 per 1,000 population (1898), ~5% of households. Automobile: <1% (registration incomplete pre-1910). Electricity: <5% of homes (urban only). Radio: not yet commercial.
1940s · Tier A
45.1% (1944) → 61.8% (1950) — see the placard
Women's unpaid home production
hours per week, prime-age women
⚠ From 2010s onward the source is ATUS (all adults 15+, hrs/day, narrower 'household activities'), not Ramey (prime-age women 18-64, hrs/week, broader 'home production') — a concept splice. ATUS facts remain available in their rooms, but render as linked gaps on this weekly axis rather than as a false decline.
Men's unpaid home production
hours per week, prime-age men
⚠ From 2010s onward the source is ATUS (all adults 15+, hrs/day, narrower 'household activities'), not Ramey (prime-age men 18-64, hrs/week, broader 'home production') — a concept splice. ATUS facts remain available in their rooms, but render as linked gaps on this weekly axis rather than as a false rise or decline.