I think the issue is, that you think if you got UBI that you would get that in addition to whatever wage you have. That's not true. Most jobs would lower their wages by that amount, so it's not additional.
The biggest impact is on the lowest earners because all of a sudden, companies who have traditionally paid the least suddenly have a team of people who's salaries have doubled. They can't reduce it because why would people work for nothing or so little? Some people will get upset by this "unfair" increase and assume it'll be paid for our of their wages, but really the government has to tax the companies more, not people. It becomes a standard cost of business in the UK and you'll see some increases but it should not double costs or cause some sort of hyper inflation.
If we look to America, we see how the service industry is dealt with and the fears about paying them a living wage and how food will sky rocket. Then compare to the UK and you'll see there's not a huge difference in cost between a static wage and one subsidised by tipping. In reality, the company does make less profit and some cost is pushed up, but it's far less severe than imagined. Market forces will still keep costs low. Companies will make less profits, but it's shown they will survive just fine.
Somebody like myself will see no increase at all and I doubt I'd see more taxes. If I did, I'd demand higher wages or move somewhere else, because at the end of the day, this is an exercise on valuing peoples contribution, less reliance on the state, independence, freedom and fairness.
The real question is, what job would you be doing if you could take your time and find something you enjoy, or what would you do if you did not have the financial pressure to keep money rolling in to pay basic bills? I know plenty who would concentrate on things that bring them joy, we'd see a flourish in art and culture not seen for many years.
Look at Germany where the unemployment benefits maintain your wages whilst you look for a new job. Similar system.
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