Affirmative action based on economic status
The reservation system in India is based on caste. Similar affirmative action policies of many other countries are based on minority communities. I think Israel is an example.
Is there a country who reserves seats in jobs, university admission, etc. based on wealth of the people?
The only answer I found is India itself. Along with caste based reservation, India also has reservation for those with low economic status. It is called EWS (Economically Weaker Section) which provides 10% reservation for the General category.