Mr Milind Sabnis, you are again not accepting the facts. If Tata/Birlas/Ambanis, don't get raw materials & cheap labour from Jharkhand, Oriisa ,WB, MP, etc, & also if they don't have rich market like North , they won't be making any profits by making & selling their products in Mumbai. The reason for them making Mumbai their HQ are historical & it happened more than 50 years back . Given an option now, they would definitely relocate their HQ to Delhi like most MNC's did & are doing owing to its better infrastructure. Also again i would like to help you understand that its not Mumbai's money but local money generated by economic activity in Delhi , which has led to its development.