It's already way beyond the level where it harms productivity.
Independent economic research commissioned by the previous Chancellor stated this. At all levels of earnings people are concluding it's simply not worth working full time because of the cliff-edges.
It was reported widely, e.g. in The Guardian, The Times. Did Hunt listen? No. Will Reeves? I highly doubt it.
Yet again we have a Government concerned with political optics (whatever their preferred flavour) rather than evidence-based policies that will actually work.
It's very depressing reading this thread. Almost all comments relate to how to divide up the scraps and vindictiveness against others: anyone who earns more than them, anyone who receives any state assistance, even disabled people!
None propose any sensible ways to actually improve the economic outlook of the UK and as you touched on, the only way to do so is to improve productivity. The UK has an enormous current account deficit - that has quadrupled since Brexit (unsurprisingly) so is very vulnerable and living on borrowed money, effectively: it does not create enough wealth to support what its population have come to demand in services. Trashing its trading relationships and the exports it had, and making it unattractive to foreign investors who plugged the gap in the current account deficit for years was obviously unwise, particular given its reliance on imports for necessities like food and fuel, so we have high levels of imported inflation.
Many of the "suggestions" here are also economically irrelevant in terms of scale and would make no difference whatsoever. MPs expenses, moving "free prescription" age to 60. I mean, the prescription charge is a tiny fraction of the costs of medicines regardless! All "political" issues but a rounding error if that economically. Tinkering around the edges with pointless measures.
If a Government actually wanted the UK to be prosperous it would:
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Immediately begin negotiations with the EU to rejoin the single market and customs union. This alone is costing us around £50bn per year, rising annually.
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Produce a proper industrial strategy for investment in our high-tech sectors with growth potential e.g. robotics, AI, life sciences, pharmaceuticals, tech. Public/ private partnerships for investment and financing of these. Support for start ups and small to medium-sized businesses that make up half of the UK economy, and better access to finance to prevent foreign buyouts.
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Total overhaul of the NHS introducing a healthcare model comparable to that in France, Germany, Australia or similar.
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Total overhaul of education, particularly proper SEN provision. Adult education implementing a model based on the Scandinavian countries. Also linking worthwhile technical apprenticeships with businesses to ensure relevant skills to meet demand, as in Germany, for example.
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Overhaul state pensions to introduce a long-term model in a gradual process over decades where instead of being funded by current taxation they are saved as an individual "pot" contributed by the individual, therefore not subject to issues due to denographic changes.
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Ensure a long-term cross party agreement is in place with a clear plan to ensure water, food and energy security in the coming decades.
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This one is the one I mentioned in the first part of my post and - unlike the others - is within treasury power to implement instantly and have effect within just a few months: implement a fair tax system that encourages people to work at all levels of earnings. I.e. scrap the withdrawal of child benefit and the personal allowance, vastly reduce the Universal Credit taper rate, remove the means-testing of childcare funding (and make it sufficient to cover the costs of providers properly), levy tax on a household income basis like pretty much every other developed country to remove the huge economic distortions currently affecting economic participation.
None of this is complicated. All of it is what sensible, comparable (or, used to be comparable before we trashed ours) countries do already. No need to "reinvent the wheel". Follow the already-proven models that actually work and make a country prosperous.
But despite having a Chancellor for once who is an economist so doubtless does know that this is what she should be doing, I have little faith that she will. We have terrible politicians in this country, whichever party they come from, who care only for short-term politics not the long-term prosperity and wellbeing of their citizens. And an electorate who seem very ignorant about even basic economics so are happy for this to continue and do not demand that their MPs actually address the issues that matter.