if on average society is poor (say average income y) and there are fixed
costs to set up a business of F > y then if all people are equally rich no one can set up business
(e.g. adopt modern technology) and the economy stays in subsistence. (think why)
However, if there were some people with income > F (and, of course, many with income < F in
order to maintain the same average y) then those rich people can adopt the modern technology
and eventually the economy may grow and escape the subsistence state.
moral and ‘fairness’ objections to inequality