macrohard

All candidate causes

Demographic ageing and fiscal pressure crowding out public goods

An older population raises tax-funded superannuation and health spending faster than the working-age tax base grows, leaving less fiscal room for capital and other services. Treasury projects NZ Superannuation rising from 5.1% to about 8% of GDP and health from 7.1% to about 10% by 2065.

Open 0 of 4 support, 1 against; partly supported needs two more.

Timing Mixed Does the cause move before the symptom?
The pressure builds gradually: NZ Superannuation rose from 3.9% of GDP (2006) to 5.1% (2025), with 0.2 points more forecast by 2031; the 65+ share went from 13.0% (2010) to 17.6% (2025). The symptoms moved more abruptly. Health spending rose rather than being crowded out, so waits fit ageing demand, not tested here.NZ Superannuation +1.2 points of GDP over 19 years = about 0.06 points a year; a further +0.2 points forecast to 2030/31. 65+ share 13.0% to 17.6% = +4.6 points, 2010 to 2025.Treasury, He Tirohanga Mokopuna 2025: Long-term Fiscal Statement; Treasury, Pre-election Economic and Fiscal Update 2026 (29 Sep 2026); World Bank, World Development Indicators: population ages 65 and above, 2000-2025; Health New Zealand, Health targets: 5 and 10 years of results, Q4 2025/26 (2026)
Distribution Mixed Is the symptom worse where the cause is stronger?
Across 19 Health NZ districts the share of elective patients waiting under 120 days shows no age gradient: rank correlation with the 65+ share is +0.23 (p = 0.35) and -0.02 (p = 0.94) with its 2018-25 growth. Council infrastructure was not tested.Spearman rho, n = 19 districts (Capital and Coast joined with Hutt Valley): share under 120 days at June 2026 vs 65+ share 2025 = +0.23; vs 2018-25 change = -0.02. The 120-day field is a proxy for the target.Health NZ, Waitlist detail extract Q4 2025/26 (Elective Waitlist sheet); Health NZ, Health targets factsheets Q1 2025/26 (elective target definition); Stats NZ, Subnational population estimates by health district (POPES_SUB_002)
Peers Contradicts Do comparable countries with the same cause show the same symptom?
New Zealand is not unusually old or ageing unusually fast. Its 65+ share in 2025 (17.6%) was below Denmark, Canada and Australia, and it aged no faster than they did from 2010. Older peers such as Denmark do not show New Zealand's symptoms.65+ share change 2010 to 2025: NZ 13.0 to 17.6 (+4.6); Australia +4.6; Denmark +4.6; Ireland +4.8; Canada +6.2.World Bank, World Development Indicators: population ages 65 and above, 2000-2025
Mechanism Mixed Does an official review document the pathway?
Treasury documents a prospective pathway: pressures that would require other spending to fall from about 13% to 5% of GDP by 2065. It does not document ageing as the present cause of under-investment, and finds its projections 'not particularly sensitive to different rates of capital investment'.Treasury, He Tirohanga Mokopuna 2025: Long-term Fiscal Statement

What would settle it: A district panel from 2014: elective performance and hospital demand against the 65+ share and its growth, and a peer panel of ageing against public investment and waiting times. Older, faster-ageing places should degrade most.

tested · the causes as data

Cite Demographic ageing and fiscal pressure crowding out public goods

macrohard.nz, “Demographic ageing and fiscal pressure crowding out public goods”, The Hollowing Index, tested 2026-09-30. https://macrohard.nz/causes/demographic-ageing