But why can anyone not become rich?
This world has never been equal, if someone wants to be rich he has to do something and change his way of living through hard work and ideas, ideas that will change his life and the lives of others as well.
What are the reasons why others work hard yet they are still poor?
Unlimited spending, uncontrollable expenses and not being wise of holding money.
Why can't we print enough money for everyone?
Inflation.
Basically the sole purpose and aim of economics is to devise way to meet the unlimited and ever growing needs with the limited resources. This has two solutions. Either rise your production which in tern will boost your GDP which will also improve the living standards of the people. Another way is to reduce the demand for luxuries and just consume the basic needs. Since the former does not sounds as impossible as the latter, the world has invented ways to maximize the per capital income and this has given the freedom to consume as much of the depleting natural resources as could be paid for.