I think it was GDP, probably ppp. This explains it a bit better: https://cebr.com/blogs/claims-that-poland-will-be-richer-than-the-uk-this-decade-are-overambi

I think it was GDP, probably ppp. This explains it a bit better: https://cebr.com/blogs/claims-that-poland-will-be-richer-than-the-uk-this-decade-are-overambitious-but-only-just/ https://cebr.com/blogs/claims-that-poland-will-be-richer-tha... It was hyperbole, but the ppp gap will keep on shrinking and with that the desire of poles to even go to the UK will keep decreasing.