An annual study has revealed India's financial capital Mumbai to be among the wealthiest cities in the world. Mumbai City was at the 16th spot of the report published by independent global property Knight Frank's Wealth Report 2018. The research was based on four main factors, wealth, investments, lifestyle and future. The research further indicates that Mumbai and Delhi would be among the top 10 markets to witness the highest addition household earning more than $250,000 annually between 2017 and 2022. The research further showed that the list of ultra-rich people is growing rapidly. According to the report, 2.5 million people have assets of 5 million dollars in the world in 2017; which has been up by 9% as compared to 2016. In Asia, the number of ultra-rich people has grown by 37% which was much higher as compared to Europe which increased by 10%. The list of billionaires in India has also grown in comparison to 2017. Reportedly in 2018, India has almost 119 billionaires as compared to 2017 in which there 101 billionaires.