Well I'm no economist but I'm going to take a few wild guesses.
If we want stuff to be cheap (food, toys, technology, building materials, etc), we have 2 options:
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grow or make it within our own country whilst expecting the people involved in doing that work to be content with the sort of shitty standard of living that would keep prices down and make us globally competitive;
-
get it from other countries on the basis that we expect the people from there to accept having a shitty standard of living.
Wildcard: Some countries try to bypass the issue by creating a group of second class citizens living like modern slaves who come to work but get trapped in a shitty standard of living (the Dubai Model / Atlantic Slave Trade Model / slavery throughout human history model).
All colonial powers used to operate based on a combination of all 3 of these options. As our own labour movement won more rights for workers, the expansion of education and increases in wages, option 1 became increasingly unsustainable in the western world. We exploited people in other places to make up for it becoming more difficult to exploit our own. Standards of living improved but prices rose too.
We have more recently tended to go for option 2. The wildcard option has operated at times (not slavery in name of course) but with those workers who came here from other places either getting fed up and realising they can get a better deal elsewhere, or staying long enough to join the 'first class citizen' ranks.
Global circumstances - demands for increased standards of living across the world; our decreasing levels of both hard and soft power - mean that we struggle to survive on option 2. We have outsourced our food and materials and are now therefore at the mercy of other states over whom we have no control.
Add into the mix also that as a nation we are short on the skills we need (like how to make stuff or grow stuff or fix stuff), which further pushes prices up. We are also short on the young. So we live longer and it all costs more and more and there is no one to pay for it. Many of us have come to expect things that human beings have simply not been able to expect in almost any place or time in human history (like a long retirement, exotic holidays even if you don't have much money, and access to a wide variety of cheap food and clothes to fulfil our every whim), and are understandably horrified by these things becoming less available, but I don't think our collective lifestyle is sustainable.
PS when people talk about how our services are inefficient and we 'waste' money on bloated NHS management jobs etc, I'm not saying they are necessarily wrong. I will say however that it is a drop in the ocean compared to the big picture of what is wrong - the trajectory that means our standards of living are probably going to go downhill across Europe for quite some time. Cutting government waste is effectively tinkering around the edges.
Disclaimer: I am a grumpy socialist and a pessimist, so I hope other posters will give you answers with more hope in them!