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Topic dossier · Institutional Funds Nexus

Intergenerational equity

Pension systems, sovereign funds and endowments move resources across generations: contributions today pay benefits tomorrow, and spending today draws on capital meant to last. How those systems are designed decides which cohorts bear market, longevity and inflation risk, and who pays when promises and assets diverge. This page sets out how intergenerational transfers arise in funded and pay-as-you-go systems, how they are measured, and what the evidence serves for the legislatures, boards and ministries who set the rules.

01In brief

The short answer.

Intergenerational equity is the fair treatment of different generations in how resources and risks are shared over time. Pension systems, sovereign funds and endowments move resources across cohorts: contributions today pay benefits tomorrow, and spending today draws on capital meant to last, so design decides who gains and who pays.

02Geography

Activity and exposure in Oceania and the Pacific.

For intergenerational equity, in GRA's spatial-finance reading, the map opens on population density and night lights with built-up and settlement extent from NASA GIBS, framed on Oceania and the Pacific; every other NASA layer, live feed and forecast waits in the layer list.

The interactive map needs JavaScript; the layer list and sources are below.

Layers 2

Activity and exposure, for this page

Latest available

NASA GIBS / EOSDIS · ASTER GDEM (METI, NASA) · Blue Marble (NASA) · © OpenStreetMap contributors (ODbL) · Natural Earth

Loading the latest NASA imagery.

Drag to move. Ctrl or ⌘ and scroll, pinch or the buttons to zoom; hover for the values under the pointer; reset returns to the region.

For intergenerational equity, in GRA's spatial-finance reading, the map opens on population density and night lights with built-up and settlement extent from NASA GIBS, framed on Oceania and the Pacific; every other NASA layer, live feed and forecast waits in the layer list.Satellite and model products as NASA publishes them, each with its own date; indicators, not assessments of any place; claim ceiling INTEGRATED.

Data: NASA GIBS · ASTER GDEM · Blue Marble · © OpenStreetMap contributors · Natural Earth · GDACS · CIESIN/Columbia, NASA SEDAC HBASESources and licences

  • We acknowledge the use of imagery provided by services from NASA's Global Imagery Browse Services (GIBS), part of NASA's Earth Science Data and Information System (ESDIS). Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • We acknowledge the use of imagery provided by services from NASA's Global Imagery Browse Services (GIBS), part of NASA's Earth Science Data and Information System (ESDIS). Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • Center for International Earth Science Information Network (CIESIN), Columbia University. 2018. Gridded Population of the World, Version 4 (GPWv4): Population Density, Revision 11. NASA Socioeconomic Data and Applications Center (SEDAC). Licensed under CC BY 4.0. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). CC BY 4.0
  • VIIRS Black Marble night-time lights, NASA Goddard Space Flight Center; distributed by the NASA Level-1 and Atmosphere Archive and Distribution System (LAADS DAAC); imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • VIIRS near-real-time products (flood, land surface temperature, snow cover, corrected reflectance), NASA LANCE; imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • MODIS land products (vegetation indices, gross primary production, land cover), NASA LP DAAC and LANCE; imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • ASTER GDEM is a product of METI and NASA (ASTER Global Digital Elevation Model V003, NASA LP DAAC); imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • Made with Natural Earth. Free vector and raster map data @ naturalearthdata.com. Public domain
  • © OpenStreetMap contributors (ODbL), via NASA GIBS (coastlines, boundaries, roads and place names). Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). ODbL
  • Blue Marble, NASA Earth Observatory; imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • Context on the globe and flat map: coastlines, boundaries, roads and place names from NASA GIBS reference layers (OpenStreetMap data, ODbL, © OpenStreetMap contributors); Blue Marble imagery as an optional base; 3D terrain and the elevation read-out from the ASTER GDEM elevation colour index (5 m to 200 m classes, exaggerated for legibility). Boundaries are drawn as published and imply no position on any territory.
  • Globe: MapLibre GL JS 6.9.1, BSD-3-Clause, © MapLibre contributors.
  • Live: GDACS (EC JRC / UN OCHA) Events are indicative, not official warnings.
  • Context: CIESIN/Columbia, NASA SEDAC HBASE. Center for International Earth Science Information Network (CIESIN), Columbia University, and NASA Socioeconomic Data and Applications Center (SEDAC): Global Human Built-up And Settlement Extent (HBASE) 2010; Seto, Guneralp and Hutyra 2012, Global Grid of Probabilities of Urban Expansion to 2030; Global Urban Heat Island (UHI) Data Set, 2013.
  • Optional layers (35 sources in the layer list: live, forecast, observed and context) print their provider credit on the map and here when switched on; forecasts are model output and derived indices are estimates.

Layers and dates

  • Population density, 2020: Population: CIESIN, Columbia University, Gridded Population of the World v4.11 (2018), NASA SEDAC, CC BY 4.0 · static
  • Night-time lights, daily: VIIRS Black Marble (VNP46A2), NASA LAADS DAAC · 12 Oct 2026
  • Flood water, 3-day composite: VIIRS Global Flood Product, NASA LANCE · 14 Oct 2026
  • Land surface temperature, day, 8-day composite: VIIRS NOAA-20 Level 3, 8-day, NASA LANCE · 14 Sep 2026
  • True colour: VIIRS NOAA-20 corrected reflectance, NASA LANCE · 13 Oct 2026
  • Land cover type (IGBP), yearly: MODIS Terra and Aqua land cover (MCD12Q1), NASA LP DAAC · 2024

03The question

Intergenerational equity: how the risk develops.

Long-term savings and social conditions. The dossier below sets out how the risk develops, what is measured, where the data come from, how it is modelled and who decides.

Mechanism

Deficits pass to later cohorts

When a funded scheme or public plan is underfunded, the gap is closed by future contributions, reduced benefits or taxpayers. Long recovery periods spread the cost forward to members and citizens who did not accrue the benefits.

Mechanism

Risk shifts from sponsors to individuals

The move from defined benefit to defined contribution transfers market and longevity risk to individuals, whose outcomes depend on when they happen to retire. Collective designs share risk across cohorts through buffers and conditional indexation.

Mechanism

Spending rules decide who benefits

Endowments and sovereign funds set spending rates intended to preserve real capital for future beneficiaries. Spending above the sustainable rate favours the present; spending below it favours the future, and both are policy choices.

Mechanism

Coverage and adequacy gaps persist

Informal workers, career breaks and lower earnings leave many people with thin pension rights, and the gaps widen with age. Adequacy and equity within a generation are part of fairness between generations.

04Key terms

Terms used on this page.

Each term as this page uses it. Where a standard-setting body defines the term, the wording follows that body.

TermDefinition
Replacement ratePension income as a share of earnings before retirement.
Spending ruleA rule setting how much an endowment or sovereign fund may spend each year.
Defined contributionA pension in which the member bears investment and longevity risk on an individual account.
05Indicators

What is measured, and how well.

Each indicator carries its unit, its cadence, the kind of source behind it and the evidence label a value would carry. No values are shown: a programme supplies them under its own authority.

IndicatorUnitCadenceSource typeLabel
Gross replacement ratepercent of pre-retirement earningseach projection roundOECD pension modelsMODELLED
Old-age income poverty ratepercent of population of pension ageannualHousehold income surveysOFFICIAL
Gender gap in pension incomepercentannualHousehold income surveysOFFICIAL
Coverage of the working-age population by funded pensionspercent of working-age populationannualAdministrative records and surveysOFFICIAL
Spending rate of an endowment or sovereign fundpercent of fund value per yearannualFiscal rules and fund reportsDECLARED
Implicit pension liability of public schemespercent of gross domestic producteach projection roundGovernment actuary projectionsMODELLED
Contribution rate to mandatory pension schemespercent of earningsannualLegislation and administrative recordsOFFICIAL
06Canvas

From sources to decisions.

The topic as a computational graph: named sources feed the methods, an evidence review gates the outputs, and the decisions stay with the authorities that hold them.

Pipeline canvas · Intergenerational equity as a run graphDesign, not a record
Intergenerational equity: climate scenario analysis pipelineOrderly, disorderly and hot house scenarios supply pathways for carbon prices and macro variables; transition and physical channels change sector and asset outcomes; credit parameters and portfolio losses follow, and results are disclosed with their limits. Design of the process, not a record of a run.

Fig. 02Nodes carry their type, two metric rows and a state; connectors show what feeds what; dashed frames name the owners; the timeline is the cadence. Design of the pipeline, not a record of a run.

07Sources

Where the evidence comes from.

Named public datasets and institutional records, each with its licence class. Sources by agreement are used only under their terms and never republished.

SourceWhat it givesLicence class
OECD Pensions at a GlanceReplacement rates, coverage, retirement ages and old-age income across countriesFree reuse, attribution
OECD Income Distribution DatabaseOld-age income and poverty rates on a comparable basisFree reuse, attribution
ILO World Social Protection DatabaseCoverage of old-age pensions and social protection by countryFree to use, attribution
World Bank ASPIRECoverage and adequacy of social protection programmes, including pensionsCreative Commons attribution
European Commission Pension Adequacy ReportAdequacy, gender gaps and projections for EU pension systemsFree reuse, attribution
US Social Security Trustees ReportLong-range financial projections of the US Social Security trust fundsPublic domain
NACUBO-Commonfund Study of EndowmentsSpending rates, allocations and governance of US college and university endowmentsSummary free to read; full study licensed
Annual reports and fiscal rules for sovereign fundsSpending rules, transfers to budgets and long-term objectivesPublic records, terms per government or fund
08Decisions

Who decides, and what the evidence serves.

Institutional Funds Nexus prepares evidence. The decisions below are taken by the authorities named, under their own rules, and never by the platform.

Who decidesThe questionEvidence this page serves
Legislatures and pension ministriesHow to set benefit formulas, retirement ages, contribution rates and indexationProjected adequacy and cost by cohort; distribution of risk under each design
Finance ministries and parliaments overseeing sovereign fundsWhat spending or transfer rule preserves the fund for future generationsReal capital projections under spending rules and return scenarios
Boards of collective pension schemesHow to use buffers, conditional indexation and benefit adjustments between cohortsCohort outcomes under scenarios and the rules that trigger each adjustment
Endowment boards and university trusteesWhat spending policy balances current support against future purchasing powerReal value and spending paths under return and inflation scenarios

Outputs this topic produces

  • Guides to how pension design allocates risk between cohorts
  • Comparisons of spending rules for endowments and sovereign funds from public records
  • Scenario illustrations of cohort outcomes under market, longevity and inflation paths
  • Research notes on coverage and adequacy gaps in funded systems
09Core questions

What experts ask.

The questions concern who pays, who benefits and when.

  • How do funding shortfalls and their remedies shift costs between generations?
  • How do discount rate choices affect the balance between present and future members?
  • Are younger workers accumulating adequate retirement savings?
  • How do long-term risks, such as climate change, affect the conditions future beneficiaries will live in?
  • Who speaks for future generations in today's decisions?
10Mechanisms

Mechanisms and drivers.

Deficits that are not funded today are paid later, by future contributions, reduced benefits or public budgets. Changes to benefit design, such as moving from defined benefit to defined contribution, shift risks between cohorts. Discount rates embed judgements about how much future obligations count today.

Beyond finance, institutional funds invest in the economy that future beneficiaries will inherit. Their decisions affect housing, infrastructure, labour markets and the environment. Social conditions, such as inequality, health and the stability of work, in turn shape whether people can save and what retirement security means.

11Methods and data

How it is studied, and where the methods stop.

Method or dataWhat it showsLimits
Generational accountingHow fiscal and pension burdens fall across cohortsDepends on long projections and assumptions
Cohort adequacy modellingRetirement outcomes by generationBehavioural and labour market assumptions
Distributional analysis of reformsWho gains and loses from changesLong-run effects are uncertain
Social and demographic researchConditions shaping saving and retirementEvidence is often national and periodic
12Methods

How it is studied, and what the methods cannot say.

  1. Actuarial mathematicsLiability valuation on several bases · Mortality and longevity projectionApplied here
  2. Decision analysis under uncertaintyRisk appetite and journey planning · Robust strategic allocationApplied here
  3. Scenario design and stress testingSupervisory pension stress test · Reverse stress test of fundingApplied here
  4. Financial economics and macro-financeCapital market assumptions · Collateral and market feedbackApplied here
13Questions

Questions and answers.

What is intergenerational equity in pensions?
The question of how costs, risks and benefits of a pension system are shared between people of different ages and between today's and tomorrow's contributors and taxpayers.
Do funded systems avoid intergenerational transfers?
Not entirely. Underfunding, guarantees, tax relief and collective risk sharing all move resources between cohorts, even in funded systems.
What is a sustainable spending rate?
A rate of withdrawal that is expected to preserve a fund's real value over time, given assumed returns and inflation. The assumption, not the rate alone, determines what is sustainable.
Why does the discount rate matter for fairness?
Because it determines how much future obligations count today. A higher rate makes future costs look smaller, which can shift burdens to future generations.
Do defined contribution schemes shift risk to younger workers?
They shift investment and longevity risk from sponsors to members. Whether outcomes are adequate depends on contributions, returns, costs and design.
Does the platform take positions on pension reform?
No. GRA does not advocate for any member or policy. It publishes sector-level research with its evidence and limits.
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