To UP/Bihar itna picchda kyun hai bhai ki tumhare priy NOrth Indians ko UP/Bihar chhodke Maharashtrian mein aana padta hai.There is scope here that makes UP/Biharis migrate to make a living and even foreign investment is attracted in Maharashtra,Gujarat and Tamilnadu because of favourable environment that the government is providing.If you say you have the capability,it is commendable and should be appropriately used in developing UP/Bihar as that is India's interest.Mumbai's geographical location closer to the developed Western countries gives it the additional advantage and is the fulcrum that has made Mumbai what it is today.Jo apni sarzameen ko sudhar na sake ho, woh UP/Bihari or Northies as Mr Mittal is saying,Mumbai kya banayenge.Mumbai ne sabko banaya hai,not the other way round.