{
  "schema_version": "immigrationdb-research-index-v1",
  "url": "https://immigrationdb.com/research/",
  "updated": "2026-08-04",
  "articles": [
    {
      "title": "The cities gaining migrants are not the cities that are growing",
      "question": "Across cities with a decade of published figures, where has the foreign-resident population grown fastest, and does that growth track overall population growth?",
      "summary": "Where are foreign populations growing fastest? Across 423 cities, growth is almost unrelated to whether the city is growing at all: 0.11 pooled, near zero by country.",
      "url": "https://immigrationdb.com/research/where-people-actually-move/",
      "json": "https://immigrationdb.com/data/research/where-people-actually-move.json",
      "markdown": "https://immigrationdb.com/data/research/where-people-actually-move.md"
    },
    {
      "title": "Where foreign populations grew, unemployment fell",
      "question": "In cities where both foreign population and unemployment have a decade of figures, do the two move together, and what does the direction tell us?",
      "summary": "Does migration follow work? Pooled across 359 cities the link looks absent at 0.12 — but Germany is −0.41 and Italy −0.34 once the countries are separated.",
      "url": "https://immigrationdb.com/research/migration-work-direction/",
      "json": "https://immigrationdb.com/data/research/migration-work-direction.json",
      "markdown": "https://immigrationdb.com/data/research/migration-work-direction.md"
    },
    {
      "title": "More foreign residents, more crime? The answer changes at every border",
      "question": "Does a higher share of foreign residents go together with a higher recorded-crime rate in cities, and does the result hold within countries?",
      "summary": "Does a larger foreign population mean more recorded crime? It depends on the country: 0.06 in Germany and the US, 0.50 in Spain and Belgium, 0.59 in the Netherlands.",
      "url": "https://immigrationdb.com/research/foreign-population-recorded-crime/",
      "json": "https://immigrationdb.com/data/research/foreign-population-recorded-crime.json",
      "markdown": "https://immigrationdb.com/data/research/foreign-population-recorded-crime.md"
    },
    {
      "title": "The highest salary is rarely the best offer",
      "question": "Across the 33 countries publishing a national median gross salary, how do the published tax and cost figures change the ranking, and where do they refuse to answer?",
      "summary": "Gross salary cannot tell you what is left after tax. Across 33 countries pay tracks grocery prices at 0.80, and the ranking mixes two different source families.",
      "url": "https://immigrationdb.com/research/gross-salary-tax-cost-gap/",
      "json": "https://immigrationdb.com/data/research/gross-salary-tax-cost-gap.json",
      "markdown": "https://immigrationdb.com/data/research/gross-salary-tax-cost-gap.md"
    },
    {
      "title": "German rent tracks density and jobs — not crime, not clean air",
      "question": "Across Germany's 399 housing-market districts, which published characteristics move with advertised rent, and which do not?",
      "summary": "What does rent price in across Germany? Across 399 districts it tracks density and size, moves against unemployment, and barely moves with crime or air quality.",
      "url": "https://immigrationdb.com/research/german-rent-price-signals/",
      "json": "https://immigrationdb.com/data/research/german-rent-price-signals.json",
      "markdown": "https://immigrationdb.com/data/research/german-rent-price-signals.md"
    },
    {
      "title": "Clean air barely shows up in the rent",
      "question": "In places that publish both an average advertised rent and an annual PM2.5 mean, do you pay more for cleaner air, and where do you not?",
      "summary": "Do you pay more rent for cleaner air? Across 392 German housing markets the link is weak — Spearman −0.12 — and 31 districts sit below the median on both.",
      "url": "https://immigrationdb.com/research/clean-air-rent-premium/",
      "json": "https://immigrationdb.com/data/research/clean-air-rent-premium.json",
      "markdown": "https://immigrationdb.com/data/research/clean-air-rent-premium.md"
    }
  ]
}