2026-08-25, Pay pals: The geography of the minimum wage across G7 countries. Maxwell Read’s briefing cites The regional effects of Germany’s national minimum wage (Ahlfeldt, Roth and Seidel, 2018) on narrowing regional differences in the minimum-wage bite, informing its comparison of geographic wage-setting systems (Germany chapter, footnote 47). CENTRE FOR CITIES

2026-07-21, Sweden: Selected Issues — Spatial Misallocation and Labor Productivity. Xin Tang’s staff analysis cites The economic effects of density: A synthesis (Ahlfeldt and Pietrostefani, 2019) and The economics of density: Evidence from the Berlin Wall (Ahlfeldt, Redding, Sturm and Wolf, 2015) on agglomeration and on housing and commuting reforms that ease labour-mobility frictions (footnote 2; paragraph 16). IMF

2026-06-29, The economics of air transport in Europe, Part two: Air transport and tourism. Cites External productivity and utility effects of city airports (Ahlfeldt and Maennig, 2013) in its review of airport proximity, noise and property values, informing the assessment of tourism-led growth (section 2.5, p. 9, endnote 37). NEW ECONOMICS FOUNDATION / TRANSPORT & ENVIRONMENT

2026-03-06, Espoon yleiskaava 2060: Taloudellisten vaikutusten arviointi. Cites From periphery to core: Measuring agglomeration effects using high-speed rail (Ahlfeldt and Feddersen, 2018); uses rail-accessibility evidence to assess the economic effects of Espoo’s General Plan 2060 (section 3.4, pp. 31–32). CITY OF ESPOO / RAMBOLL

2026-02-27, Distribution Incidence Research. Cites The economic effects of density: A synthesis (Ahlfeldt and Pietrostefani, 2019); discusses the transferability of urban elasticities when assessing distributional weights in transport appraisal (section 4.4.2). UK DEPARTMENT FOR TRANSPORT

2026-02-09, NOU 2026: 2, Politikk for nye generasjoner. The fertility commission cites The generation gap in direct democracy: Age vs. cohort effects (Ahlfeldt, Maennig and Mueller, 2022) on ageing voters and support for environmental, family and redistribution policies (section 15.3.1, p. 167, footnote 34). NORWEGIAN MINISTRY OF CHILDREN AND FAMILIES

2026, Local taxes and economic growth. Cites Homevoters vs. leasevoters (Ahlfeldt and Maennig, 2015) on property-owner incentives and The economic effects of density: A synthesis (Ahlfeldt and Pietrostefani, 2019) on urban growth, informing its analysis of municipal tax incentives (pp. 23 and 63; references p. 77). EUROPEAN COMMISSION, JOINT RESEARCH CENTRE

2025-11, Making European Reforms a Success on the Ground. Cites Ahlfeldt and Pietrostefani (2019) and Ahlfeldt, Redding, Sturm and Wolf (2015) on agglomeration and productivity reform (p. 7, footnote 7). IMF

2025-05-26, OECD Economic Surveys: Canada 2025. Uses Demystifying compact urban growth (Ahlfeldt, Pietrostefani, Schumann and Matsumoto, 2018) to discuss densification and zoning reform (section 2.3.2, reference 36). OECD

2025-01, Les enjeux économiques de la transition vers la neutralité carbone. Cites The economic effects of density: A synthesis (Ahlfeldt and Pietrostefani, 2019); discusses housing-cost and distributional trade-offs in urban densification as part of the net-zero policy review (pp. 196–197, footnote 577). FRENCH TREASURY

2024-11-13, Jahresgutachten 2024/25: Versäumnisse angehen, entschlossen modernisieren. Cites Blessing or curse? Appreciation, amenities and resistance to urban renewal (Ahlfeldt, 2011); uses evidence on residents’ resistance to neighbourhood change in its housing-supply and planning-policy assessment (chapter 4, paragraph 354). GERMAN COUNCIL OF ECONOMIC EXPERTS

2024-11-12, Brede welvaarteffecten van de Lelylijn: Hoofdrapport. Cites From periphery to core: Measuring agglomeration effects using high-speed rail (Ahlfeldt and Feddersen, 2018); uses German high-speed-rail findings to inform the wider-welfare assessment of the proposed Lelylijn (Appendix C, Table C.1). DUTCH MINISTRY OF INFRASTRUCTURE AND WATER MANAGEMENT / TNO

2024, Auckland’s Heritage Counts 2024. Cites An assessment of the effects of conservation areas on value (Ahlfeldt, Holman and Wendland, 2012) on residents’ appreciation of green, peaceful environments and community connections, informing its review of special-character areas (p. 24, footnote 11). AUCKLAND COUNCIL

2023-11-22, Spatial general equilibrium models and their application to transport. Cites From periphery to core: Measuring agglomeration effects using high-speed rail (Ahlfeldt and Feddersen, 2018); uses evidence on rail-induced spatial clustering when assessing general-equilibrium models for transport appraisal (p. 2, footnote 3). UK DEPARTMENT FOR TRANSPORT

2023-10-02, OECD Regional Outlook 2023. Cites The economic effects of density: A synthesis (Ahlfeldt and Pietrostefani, 2019) in its discussion of regional growth and the distribution of agglomeration gains (chapter 2, reference 22). OECD

2023-09, Measuring Social Value Paper 1: Measuring the placemaking impacts of housing-led regeneration. Cites Form or function? The effect of new sports stadia on property prices in London (Ahlfeldt and Kavetsos, 2014); adapts the stadium-study method to estimate the placemaking benefits of housing-led regeneration (paragraphs 29, 39 and 46). HOMES ENGLAND

2023-04, Understanding and Quantifying Transformational Impacts from Transport Interventions: Literature Review. Cites From periphery to core (Ahlfeldt and Feddersen, 2010 working-paper version) and The economic effects of density: A synthesis (Ahlfeldt and Pietrostefani, 2019); reviews rail and density evidence to inform the appraisal of transformational transport interventions (Tables 11 and 13). UK DEPARTMENT FOR TRANSPORT / ARUP

2023-03-31, Agglomeration and transport appraisal: New developments and research directions. Reproduces density outcomes and elasticities from Ahlfeldt and Pietrostefani (2019) and cites Ahlfeldt, Redding, Sturm and Wolf (2015) when assessing amenity benefits and double-counting in transport appraisal (section 2.8, pp. 18–21). UK DEPARTMENT FOR TRANSPORT

2022-12, Developing Airport Systems in Asian Cities: Spatial Characteristics, Economic Effects, and Policy Implications. Cites External productivity and utility effects of city airports (Ahlfeldt and Maennig, 2013); uses airport-accessibility and noise evidence in its discussion of airport planning and economic effects (section 2.5). ASIAN DEVELOPMENT BANK

2022-12, Enabling business mitigation and adaptation to climate change: Green policies and the role of Employer and Business Membership Organizations — Executive Summary. Cites The economic effects of density: A synthesis (Ahlfeldt and Pietrostefani, 2019); cites density evidence in recommending local-government densification to reduce emissions and improve accessibility (PDF p. 11). INTERNATIONAL LABOUR ORGANIZATION

2022-11-28, Salaire minimum interprofessionnel de croissance: Rapport du groupe d’experts. Cites Optimal minimum wages (Ahlfeldt, Roth and Seidel, 2022); discusses optimal national and regional wage floors, including caveats about transferring German results to France (p. 119, footnote 135). FRENCH MINIMUM-WAGE EXPERT GROUP

2022-07-31, Boosting African cities’ resilience to climate change: The role of green spaces. Uses Demystifying compact urban growth (Ahlfeldt, Pietrostefani, Schumann and Matsumoto, 2018) in its discussion of compact urban form and sprawl (p. 16, reference 23). OECD/SWAC

2022-07, Levelling up and infrastructure policy. Cites From periphery to core: Measuring agglomeration effects using high-speed rail (Ahlfeldt and Feddersen, 2018) as German evidence on inter-urban rail’s local economic benefits, alongside cautions about displacement and regional distribution (p. 9, endnote 38). INSTITUTE FOR GOVERNMENT

2022-06, Luxembourg: Selected Issues. Uses the preference specification from The economics of density: Evidence from the Berlin Wall (Ahlfeldt, Redding, Sturm and Wolf, 2015) in a staff model of digitalisation and labour-market inequality (Box 1, p. 31). IMF

2022-01-28, Cost-Benefit Analysis of proposed Medium Density Residential Standards — updated report. Cites The economic effects of density: A synthesis (Ahlfeldt and Pietrostefani, 2019); uses density evidence in estimating agglomeration and transport effects of proposed residential upzoning (pp. 85 and 95, footnotes 16 and 24). NEW ZEALAND MINISTRY FOR THE ENVIRONMENT

2021-12-10, Urban sustainability in Europe: Learning from nexus analysis. Cites The economic effects of density: A synthesis (Ahlfeldt and Pietrostefani, 2019) on density, mixed use and reduced travel demand in its discussion of accessibility-focused urban planning (p. 49; references p. 115). EUROPEAN ENVIRONMENT AGENCY

2021-12-09, National Minimum Wage: Low Pay Commission Report 2021. Cites The regional effects of Germany’s national minimum wage (Ahlfeldt, Roth and Seidel, 2018); uses evidence on regional wage inequality in the analysis underpinning its minimum-wage recommendations (paragraph 3.34, p. 56). UK LOW PAY COMMISSION

2021-06, Building Back Broader: Policy Pathways for an Economic Transformation. Cites The regional effects of Germany’s national minimum wage (Ahlfeldt, Roth and Seidel, 2018); uses minimum-wage employment evidence in its recommendations on minimum and living wages (section 2.2.1, endnote 42). WORLD ECONOMIC FORUM

2021-05-31, Support study for the evaluation of Regulation (EU) No 1315/2013 on Union Guidelines for the development of the TEN-T — Case Study 5: High-speed rail. Cites From periphery to core: Measuring agglomeration effects using high-speed rail (Ahlfeldt and Feddersen, 2018); uses evidence on local economic effects of high-speed rail in the evaluation of the TEN-T regulation (PDF pp. 47, 54 and 56). EUROPEAN COMMISSION, DG MOVE

2021-05-13, Informe Anual 2020. Cites The economic effects of density: A synthesis (Ahlfeldt and Pietrostefani, 2019); cites urban-amenity and service-access benefits in its assessment of Spain’s population geography and regional-policy challenges (chapter 4, p. 296, footnote 29). BANCO DE ESPAÑA

2021-05-12, Agglomeration under Covid. Cites The economic effects of density: A synthesis (Ahlfeldt and Pietrostefani, 2019); uses density and wage-elasticity evidence in assessing how changed working patterns affect transport appraisal (section 3.1). UK DEPARTMENT FOR TRANSPORT

2021-03-19, Improving broadband for Very Hard to Reach premises — Call for Evidence. Cites Speed 2.0: Evaluating access to universal digital highways (Ahlfeldt, Koutroumpis and Valletti, 2017); cites broadband capitalisation evidence in the consultation on benefits and delivery options for hard-to-reach premises (section 5, p. 27, footnote 22). UK DEPARTMENT FOR DIGITAL, CULTURE, MEDIA & SPORT

2020-12-11, Transport Bridging Divides. Cites From periphery to core (Ahlfeldt and Feddersen, 2018) and The economics of density: Evidence from the Berlin Wall (Ahlfeldt, Redding, Sturm and Wolf, 2015); uses rail and spatial-economy evidence in discussing transport investment, land use and appraisal (chapter 1, references 68 and 84). OECD

2020-11, Response to the Open Communications consultation. Cites Speed 2.0 (Ahlfeldt, Koutroumpis and Valletti, 2014) on broadband consumer benefits to inform its argument on regulatory intervention (p. 4, footnote 8). Industry submission to Ofcom. VIRGIN MEDIA

2020-03-18, A technical assessment of the potential for a local land value tax in Wales. Cites If we build it, will they pay? (Ahlfeldt, 2013) on the Jubilee line extension’s land-value gains to illustrate publicly created land value in its assessment of the case for land value taxation (section 1.11, p. 7, footnote 1). WELSH GOVERNMENT

2020-02-20, Move to More/Less Productive Jobs. Cites From periphery to core: Measuring agglomeration effects using high-speed rail (Ahlfeldt and Feddersen, 2018); uses high-speed-rail evidence in assessing employment reallocation and productivity in transport appraisal (p. 28). UK DEPARTMENT FOR TRANSPORT

2019-11-14, Regions in Industrial Transition: Policies for People and Places. Cites From periphery to core: Measuring agglomeration effects using high-speed rail (Ahlfeldt and Feddersen, 2018); uses German rail findings to discuss connecting lagging areas to centres of economic activity (chapter 6, “Linking areas to capitalise on agglomeration economies”). OECD

2019-06-24, OECD Economic Surveys: New Zealand 2019. Uses Demystifying compact urban growth (Ahlfeldt, Pietrostefani, Schumann and Matsumoto, 2018) to discuss housing policy, infrastructure costs and density trade-offs (chapter 3, reference 38). OECD

2018-12-05, State of the North 2018: Reprioritising the Northern Powerhouse. Cites How polycentric is a monocentric city? Centers, spillovers and hysteresis (Ahlfeldt and Wendland, 2013) to argue that regional development policy should account for economic specialisation at different spatial scales (p. 15; references p. 54). IPPR NORTH

2018-11, Effects of Regulation on Service Quality: Evidence from Six European Cases. Cites Distinctively different: A new approach to valuing architectural amenities (Ahlfeldt and Holman, 2017); uses architectural-amenity valuation evidence in assessing regulation and service quality (architects case study, PDF p. 66). EUROPEAN COMMISSION, DG GROW

2018-05-22, Ruimtelijke- én mobiliteitsprojecten in de stad: wat en hoe groot zijn de effecten?. Cites Form or function? (Ahlfeldt and Kavetsos, 2014), Homevoters vs. leasevoters (Ahlfeldt and Maennig, 2015), and Ease vs. noise (Ahlfeldt, 2016); uses amenity, airport and noise evidence in guidance on assessing urban spatial and mobility projects (pp. 20, 36, 44 and 51). DUTCH MINISTRIES OF THE INTERIOR, FINANCE, AND INFRASTRUCTURE AND WATER MANAGEMENT / CPB

2018-05-19, Divided Cities: Understanding Intra-urban Inequalities. Uses the density synthesis and compact-city review by Ahlfeldt and Pietrostefani (2017) to frame the relationship between density, housing costs, amenities and income segregation (chapter 2, p. 36). OECD

2018-03-15, OECD Territorial Reviews: The Megaregion of Western Scandinavia. Cites From periphery to core: Measuring agglomeration effects using high-speed rail (Ahlfeldt and Feddersen, 2017 online version); uses German high-speed-rail evidence to discuss the proposed Oslo–Gothenburg–Malmö/Copenhagen corridor and the distribution of its potential benefits (Box 1.5, pp. 51–52). OECD

2018-01, New or improved rail lines: Evaluation case studies of local economic impacts. Cites If we build it, will they pay? Predicting property price effects of transport innovations (Ahlfeldt, 2013); uses property-price capitalisation evidence in selecting indicators for rail-project evaluation (paragraph 2.6). UK DEPARTMENT FOR TRANSPORT

2017-01-11, The Global Risks Report 2017. Cites Après nous le déluge? Direct democracy and intergenerational conflicts in ageing societies (Ahlfeldt, Maennig and Steenbeck, 2016) and related Brexit commentary in its discussion of intergenerational political divides (Part 1, p. 23, endnote 31). WORLD ECONOMIC FORUM

2016-04-11, OECD Territorial Reviews: Japan 2016. Cites From periphery to core: Measuring agglomeration effects using high-speed rail (Ahlfeldt and Feddersen, 2015 working-paper version); uses German high-speed-rail evidence to assess possible spatial and housing-market effects of Japan’s planned maglev line (Box 3.6, pp. 171–172). OECD

2016, It-infrastrukturen – i dag och i framtiden, 2016/17:RFR1. Cites Speed 2.0 (Ahlfeldt, Koutroumpis and Valletti, 2014 working-paper version); uses broadband property-price evidence in the parliamentary assessment of future IT infrastructure (appendix section 2.5.10, p. 154). SWEDISH RIKSDAG

2014-12-12, The Political Economy of Infrastructure in the UK. Cites Form or function? The effect of new sports stadia on property prices in London (Ahlfeldt and Kavetsos, 2014); uses stadium property-value effects to discuss benefit distribution and consent in infrastructure decision making (p. 7). INSTITUTE FOR GOVERNMENT

2014-10-23, Housing That Works for All: The Political Economy of Housing in England. Cites Voting on a NIMBY facility (Ahlfeldt and Maennig, 2012) as evidence on homeowner incentives, informing its analysis of opposition to housing development and planning reform (section 3, p. 15, footnote 42). INSTITUTE FOR GOVERNMENT

2012-07-04, Report on Safeguarding Northern Ireland’s Listed Buildings. The appended historic-environment review cites Substitutability and complementarity of urban amenities (Ahlfeldt and Maennig, 2010) on property-value spillovers from built heritage (Appendix 3, Annex 4). NORTHERN IRELAND ASSEMBLY

2011, High Speed Rail: Written evidence HSR 121. Uses From Periphery to Core (Ahlfeldt and Feddersen, 2010) on GDP and market access to support northern connectivity (paragraph 39, footnote 25). Evidence submitted by the Association of North East Councils. HOUSE OF COMMONS TRANSPORT COMMITTEE