HU Berlin (full professor), LSE (visiting professor), BSoE (faculty), RSUE (editor) CEPR (Affiliate) CESIfo (fellow) LSE-CEP (Affiliate) http://bqse.dehttps://bsky.app/profile/ahlfeldt.bsky.socialhttps://bsky.app/profile/ahlfeldt.bsky.social/post/3mi243myti22pWe have too little architectural quality—even though it pays. The reason is a coordination failure. 👉 Should policy step in? Our @econ-observatory.bsky.social coverage https://www.economicsobservatory.com/why-dont-we-have-nicer-buildings of our @bsoeberlin.bsky.social @cep-lse.bsky.social DP https://github.com/Ahlfeldt/DPs/blob/main/GA_EP_AZ_-_Architecture.pdf27 Mar 2026 12:19 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3mi243myti22phttps://bsky.app/profile/ahlfeldt.bsky.social/post/3mhssspb5ss2h@tagesspiegel.de with coverage of the AHSY index (w dashboard): https://interaktiv.tagesspiegel.de/lab/gewerbemieten-wie-steigende-mieten-fuer-einzelhandel-und-gastronomie-deutsche-staedte-neu-sortieren-landkreis-karte-analyse/ Here is our @bsoeberlin.bsky.social paper with the underlying methodology: https://github.com/Ahlfeldt/DPs/blob/main/GA_SH_TS_FY_-_Productivity.pdf For those who cant get enough: our 1h live debate 😎: https://www.tagesspiegel.de/kneipe-weg-kette-rein--stirbt-die-vielfalt-in-unseren-stadten-diskutieren-sie-mit-beim-tagesspiegel-high-noon-expertentalk-15382444.html24 Mar 2026 14:44 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3mhssspb5ss2hhttps://bsky.app/profile/ahlfeldt.bsky.social/post/3mhftubhzp22kWe revised our Skyscraper Revolution paper https://github.com/Ahlfeldt/DPs/blob/main/GA_NBS_JR_-_SkyscraperRevolution.pdfNow Added indirect inference to estimate the QoL effect of density by matching causal reduced-form estimates in the model => more realistic counterfactuals. Quick read @voxeu.org: https://cepr.org/voxeu/columns/tall-buildings-lead-more-compact-and-productive-cities @bsoeberlin.bsky.social19 Mar 2026 10:58 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3mhftubhzp22khttps://bsky.app/profile/ahlfeldt.bsky.social/post/3mf3h3ulh2c2w☕Kaffee für alle oder schicke Cafés für coole Kieze? 🤎 Wir diskutieren live zur prime time in der @rbb24.de Abendschau @humboldtuni.bsky.social @bsoeberlin.bsky.social Interview: https://box.hu-berlin.de/f/3b351d1660ee4efb955c/ Ganzer Ganzer Beitrag: https://www.rbb-online.de/abendschau/videos/20260217_1930/chinesische-kaffeekette-startet-mit-dumpingpreisen.html17 Feb 2026 20:53 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3mf3h3ulh2c2whttps://bsky.app/profile/ahlfeldt.bsky.social/post/3mevyzjxbk22l"The price of productivity is not paid in wages alone. A large share is paid in rents." Our @bsoeberlin.bsky.social INSIGHTS piece summarizes why considering commercial rent capitalization is important to properly estimating agglomeration effects. https://berlinschoolofeconomics.de/insight/the-price-of-productivity15 Feb 2026 16:58 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3mevyzjxbk22lhttps://bsky.app/profile/ahlfeldt.bsky.social/post/3meo44mq2js25The agglomeration elasticity may be larger than widely believed (if we account for capitalization in commercial floor space prices). And the first micro-geographic commercial rent index for Germany!!! 😎 @bsoeberlin.bsky.social DP: https://opus4.kobv.de/opus4-hsog/frontdoor/deliver/index/docId/6111/file/BSoE_DP_0091.pdf Data: https://github.com/Ahlfeldt/AHSY-toolkit12 Feb 2026 13:32 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3meo44mq2js25https://bsky.app/profile/ahlfeldt.bsky.social/post/3mcavyzdric2kGood architecture is a posterchild public good: non-rival and non-excludable. Had great fun using the economics toolbox to study why developments look rather underwhelming and simulate what policies could lead to more beautiful cities. @bsoeberlin.bsky.social https://github.com/Ahlfeldt/DPs/blob/main/GA_EP_AZ_-_Architecture.pdf12 Jan 2026 20:48 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3mcavyzdric2khttps://bsky.app/profile/ahlfeldt.bsky.social/post/3m7bcyxpxv22zAssessed values are good for quantification of QSMs. List prices better for hedonic valuation using panel identification. Evidence and replication studies from the NL and NYC in our @cep-lse.bsky.social DP! https://cep.lse.ac.uk/_NEW/PUBLICATIONS/abstract.asp?index=1188305 Dec 2025 20:25 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3m7bcyxpxv22zhttps://bsky.app/profile/ahlfeldt.bsky.social/post/3m6jl4s3a7c2mEver wondered what housing value proxy for sales prices to use? Long story (in our @cesifo.org DP) short: Assessed values are good for quantification of QSMs. List prices better for hedonic valuation using panel identification. https://www.ifo.de/en/cesifo/publications/2025/working-paper/mind-lag-using-assessed-and-list-prices-proxies-housing-market @hans-koster.bsky.social26 Nov 2025 09:46 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3m6jl4s3a7c2mhttps://bsky.app/profile/ahlfeldt.bsky.social/post/3m2mtjjcz7c2uSo proud of her! 🍾 [contains quote post or other embedded content]07 Oct 2025 19:14 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3m2mtjjcz7c2uhttps://bsky.app/profile/ahlfeldt.bsky.social/post/3lvsznyilc22vI am too young to get nostalgic (at least I pretend), but 10 years after the "Berlin Wall" paper and with 15 years newer data I realize two things: 1) The Berlin spatial structure did not change that much 2) how much more convenient it has gotten to collect land values 😀 @reddingecon.bsky.social07 Aug 2025 15:13 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3lvsznyilc22vhttps://bsky.app/profile/ahlfeldt.bsky.social/post/3luia37zhkk23What a fabulous 2025 @bsoeberlin.bsky.social www.bqse.de seminar season it has been! Thanks to all the co-organizers, our manager @immanuelfeld.bsky.social , all speakers, guests, and locals! You have been a fantastic spatial community! https://sites.google.com/view/bqse/bqse-seminar/2025-season21 Jul 2025 14:44 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3luia37zhkk23https://bsky.app/profile/ahlfeldt.bsky.social/post/3lu5xxrrn722eLast day of the @bsoeberlin.bsky.social course in Quantitative Spatial Economics. What a great cohort! If you spot any of these faces on the job market, don't hesitate! Thoroughly impressed by their coursework—the nerdy discussions during the lectures: priceless! 🫰 https://sites.google.com/view/bqse/bqse-teaching/2025-qse-course f17 Jul 2025 12:52 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3lu5xxrrn722ehttps://bsky.app/profile/ahlfeldt.bsky.social/post/3lt4yjo7ces22Preparing my Applied Econometrics course @humboldtuni.bsky.social using @gaborbekes.bsky.social great textbook gabors-data-analysis.com. Added a nerdy exercise to the application of Random Forrest to predicting Airbnb prices. OLS beats Random Forrest when predicting outside a spatial window!04 Jul 2025 10:04 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3lt4yjo7ces22https://bsky.app/profile/ahlfeldt.bsky.social/post/3lq5j6zikyk2aThe 2025 season of the @bsoeberlin.bsky.social QSE course is running. Here is how it is going: https://sites.google.com/view/bqse/bqse-teaching/2025-qse-course. And here is my latest toy for the current cohort and anyone else. Maybe the simplest way of computing travel time matrices, designed for noobs! https://github.com/Ahlfeldt/TTMATRIX27 May 2025 10:47 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3lq5j6zikyk2ahttps://bsky.app/profile/ahlfeldt.bsky.social/post/3lljhez7iic2sThanks to all presenters and discussants. So far, it seems to be going well (touch wood), thanks to our fantastic teams of true organizers! @bsoeberlin.bsky.social [contains quote post or other embedded content]29 Mar 2025 13:40 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3lljhez7iic2shttps://bsky.app/profile/ahlfeldt.bsky.social/post/3ll4jp3fbpc2cSo cool, the first @bsoeberlin.bsky.social post is about spatial economics and why it matters!!! 😎 [contains quote post or other embedded content]24 Mar 2025 10:17 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3ll4jp3fbpc2chttps://bsky.app/profile/ahlfeldt.bsky.social/post/3ljkf7nu5jk24Städterankings nach Lebensqualität sind lustig. Immer kommt was anderes raus. Nicht mit uns!😀 Lebensqualität (zumindest das, was Ökonom:innen darunter verstehen) lässt sich auch objektiv messen. Ist das Ranking plausibel? @makronom.bsky.social @bsoeberlin.bsky.social https://makronom.de/wie-wichtig-lebensqualitaet-fuer-wohnortentscheidungen-ist-4844604 Mar 2025 11:44 +0000at://did:plc:xtgnrtirpwle6hb6yrcv3dkp/app.bsky.feed.post/3ljkf7nu5jk24