Well a lot of it comes down to how much money you invest or save
like even someone making 20,000$ a year can become a millionaire in...
about 60 years just by saving most of what they make, not even investing it
but if they are living on such a small amount of money in the first place its not like they need the full million
and if the money is invested in fundamental things like fish farming silvopasture agroforestry retail and the like then there wont be too much risk
and they will still be able to get interest from that.