A very neat formula:
There are world wide around three billion adults ready and willing to work, but, owing for example to mechanization of agriculture, only about 1.2 billion jobs that really need to be done.
What do we do about the missing 1.8 billion we don't really have work for?
Resources available, food, housing and such are adequate to provide for the entire world population. Are those who work willing to let those who don't, live for free?
No. Not on my dime! There's the real problem, at least the first half of the real problem.
In theory of course, if you're content with what you do, why insist on being able to control others? If you're not, get out and do something else.
(Voltaire put it rather neatly "The comfort of the rich demands an ample supply of the poor.")
The second half of the problem is commercial and financial. Who is going to buy the mountains of goods and services the corporations hold in their inventories?
(Debt is a form of currency, and the 1.8 billion can be, and often are, forced into selling their children, their bodies, and their internal organs, but this only buys time, pushing the problem into the future, while the rich enjoy the comforts Voltaire describes. Militarized oppression can hold them down, but the debt slaves still have no money to buy the inventories.)