The problem we expected to have with a "modern economy" was, basically, not enough work.
And to some extent that's true. We will, eventually, pretty much replace/automate all the low end simple jobs, and even some of the medium complex ones.
So the question is, what to do with al the people? Do we
* give them nothing and let them starve to death? (pure capitalism ... possibly Americanism)
* give them fake jobs and have them just about cope? (this is what Soviet Russia did )
* just give them money and basically leave them to play - this hasn't really been tried yet
* something else ... ok, what?
In rich economies, there is definitely enough money for everyone there to have a reasonable life. There's no real reason for anyone to stave, be sick, or not have a roof over their head. The problem is distribution.
In many societies, taxation is adequate to house and basically support its unproductive people. Norway manages this, for example. Other countries make it tougher for their unproductive, from Australia, where it's pretty tough (but some manage to kinda live, and mainly surf), to the USA where it can be very tough indeed, to various countries in Africa where you beg or starve.
I rather like the gentler approach, where people have a basic income, enough to have a tolerable life, with minimal luxuries. In fact, many things we might consider luxuries, like internet access, are in fact very cheap. Medical services can be covered fairly well also (almost everywhere manages this, except, inevitably, the USA). Housing is more challenging, as housing costs have got out of hand in many cities (certainly mine, Sydney).
If you oppress the poor and unproductive too much, they will riot and rebel. Even in ancient Rome, they realised this, thus free bread and circuses.
But imagine the life we could all have where we could, if we wished, take a year off and just hang in there, with enough to get by on. You could try a new project, paint a new painting, write a book, or even just laze in the sun (or snow, to choice). You'd work to get luxuries, or because you wanted to.
It sounds somewhat idyllic, doesn't it? But we are easily rich enough for this. Easily. If, for example, countries cut back considerably on their military outgoings (especially the USA, which spends an incredible 800 billion each year), and replaced most of their other social support, (and taxed the wealthy people and companies property) this could be afforded pretty easily.
USA 25 million unemployed. Give them, say 400 per week (21k per year, considerably above the USA poverty line of 12k) , and we get 520 billion per year. Much less than the military budget. And they'd pump all of that straight back into the economy (instead of saving it, like rich people do). This is not to mention the savings from Social Security, food stamps, etc, which the USA is awash with. (I still can't believe that Walmart actually issues its staff with instructions on how to claim food stamps).
We should do this.