Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
The border between the Republic of Ireland and Northern Ireland is often characterised as ‘invisible’. Using data drawn from censuses in both jurisdictions, we show a substantial discontinuity in commuting behaviour at the Irish border. Residents on both sides of the border have a low propensity to work on the other side. Local areas in Northern Ireland with larger Catholic populations are more prone to commuting from North to South, hinting at a possible role for socio-cultural factors.