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If we are the rich west, why can't we just take care of everyone?What does it mean to "take care of everyone"? That their "basic needs" are met? What do you define as basic needs? I will assume that this will include at least food, housing, and clothing. Is it acceptable to provide everyone with rice? Potatoes? Do we have to provide them meat? Is it acceptable to offer them housing somewhere in the country or does it have to be near where they currently are? If the latter then how do you determine who gets displaced further away?
Now the answer is likely going to be "we give them money, so they can decide". The problem with this answer is that life doesn't cost the same everywhere in the US. $1,000 a month is enough to live on in some areas, whereas others $1,000 will barely get you a living space and nothing else. Obviously you can't give people in more expensive areas more money, because then everyone would want to be in the expensive areas.
So, how much should we give people?
When answering that question keep in mind that there are 330 million people living in the US. If you give everyone $1,000 a month it will cost you $4 trillion. US tax revenues in 2019 amounted to $3.5 trillion.[0]
To put this into perspective: US mandatory spending in 2019 was $2.7 trillion.[1] This is stuff like Social Security, Medicare, Medicaid, veterans programs etc. You can't just renege on all of these obligations, because the government gave people guarantees on them - that's what they paid taxes for. It's unlikely people would accept less money than what they were promised. Not to mention that you probably couldn't cut Medicare and Medicaid anyway. That's already a trillion gone from the budget.
You probably also can't cut much from discretionary spending. You'd be cutting the military and basically every other non-social service the government does. Stuff like NASA and environmental research etc.
Ultimately, just $1,000 a month per person would require an enormous budget increase to the tune of >$2 trillion a year. Keep in mind that the US budget deficit is already at $1 trillion a year. You'd have a deficit of $3 trillion or require an enormous tax increase (almost doubling tax revenue). And it still hinges on there being no reduction in productivity.
If you then want public healthcare too, then it gets even more expensive. Medicaid covers 64.1 million people[2] at the cost of $409 billion.[1] Getting rid of Medicare and Medicaid and replacing it with healthcare for everyone would add up to an extra cost of ~$1.3 trillion, assuming that the healthcare costs for everyone else is about the same per person as it is for people on Medicaid.
"A trillion here, a trillion there, pretty soon you're talking real money."
[0] https://www.cbo.gov/publication/56324
[1] https://www.cbo.gov/publication/56325
[2] https://www.medicaid.gov/medicaid/program-information/medica...