Sigh. No, not trickle down economics.
Just understanding that a disproportionate amount of the UK's wealth - which remember must be made every year anew - is created by a small proportion of the population.
I don't know what work you do. I've worked in a shortage industry my whole working life. A concrete, real-things industry, which Reeves is desperate to bring skilled immigrants into. Anyone who is capable of doing the type of work I do - and who wants to - already is. Recruitment is hard! That may not sit well with your egalitarian world view, but it's the reality.
And it brings large amounts of GDP - as well as real-world benefit - to the UK.
That's true of most of the young people leaving. The reason they're welcomed into other countries is that they have shortage skills - ie not many people can do what they do.
In addition to innate ability, these shortage skills are generally built up over a working life in the industry. Without people with 20+ years of serious experience, real things fail. I spend most of my time solving problems and stopping things going wrong, and the rest of my time training the next generation.
So... if all our young people with the capability and with 5+ years experience decide to leave the UK and not come back... how do you think those industries will work - and continue to bring in a gdp of £3.46 trillion every year - in 20 years time? I'll have retired. It's that 25-40 year-old group who will need to be doing then what I do today.
But they won't be doing it in the UK. That GDP for the work they do will belong to another country, not the UK.
I hate a lot of what Labour is doing, but the exodus of our 25-40 year old young professionals is the thing that has me really, really worried for the UK's future.