Sorry my dear friend, Mumbai has not devloped due to fertility of land or not but due to central aid. About 60 % of the central aid goes for four metros. My humble request is pl do not support the person who is trying to devide india. Mumbai has not devloped all alone. It majorly has corporate office with factories all around india this is primarily reason for high tax collection in Mumbai. Secondly pl remember one thing around 60 % population is in north and their leader also come up saying we will not allow companies having office in maharashtra to sell products in their teritory would mumbai be able to continue with existing prosperity. Once again i say let us unit and do not allow anybody to divide our nation on the basis of RELIGION, GEOGRAPY, CASTE AND COLOUR. IF WE UNIT WE WOULD WIN.