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I don't think the red circle's economy will ever again be as rich as the blue circle's economy. So 60% growth seems out of the question. But 40% growth in the long term feels reasonable. And 20% growth above trend over the next three decades should work. It did in East Germany.

This isn't just an NHS thing. We've got similar stagnant productivity across much of the public and private sector. I focus in detail only on transport. Because no-one can focus on detail beyond a small sector. In transport we can see the inefficiency all around us if we look.
https://twitter.com/mrianleslie/status/1785218932430766441Of course Scots don't track GDP numbers. But a society can feel it's prosperity. Scots have friends, family, and work in places like Newcastle, Sunderland, Leeds, Bradford, Birmingham, and Wolverhampton. They can feel their relative prosperity and success since devolution.
https://twitter.com/julianHjessop/status/1726644311721132135I share Julian's caution around definitions of public sector productivity. Contributing (in a tiny way, via measurements of teacher-assessments of how much kids were learning through online lessons) to some of the education data over Covid deepened that. It is often very hard.
https://twitter.com/Gilesyb/status/1720090838087487719Around 2017 I started tracking every bus and tram on a high frequency route in Birmingham and used this data to calculate the effective size of the city by public transport at different times of the day. Still to the best of my knowledge, I was first. tomforth.co.uk/birminghamisas…