I'm wildly interested what's your (and hn community's in general) proposed macro policy mix. When accounted for workforce changes (demography+participation), there was absolutely no economic growth in all developed EU economies (+UK) since the GFC. Zero productivity growth.
That's stark difference compared to US. Did Europe over-auster when US massively increased it's debt? But , as above-mentioned example shows, fiscal expansion can be challenging…
The plan Liz Truss proposed was to scrap the top rate of income tax, i.e. giving a tax break to the rich.
And the markets, understanding that it was exactly what the economy needed, reacted accordingly. By crashing.