A country is like a body, the rich being the brain and the poor, the arsehole. Income inequality will be limited if there is only 1 arsehole because the brain will be screwed if the arsehole stop shitting. However, when the brain grows too clever and starts transplanting more arseholes all over the body, the original arsehole suffered.
Why does the brain need so many arsehole? The brain loves good stuff and is greedy for more. It must make sure that there are sufficient arseholes to take care of the waste. To play safe, in case some arseholes tries to be funny, arseholes are inserted at every available space in the body.
However, the brain is realising that the transplanted arseholes bring along diseases and ills to the body. Other systems in the body also cannot cope with the ever increasing arseholes. Too late, the brain is addicted to good food and shits are flowing all over the body.