According to the independent global property consultancy Knight Frank's Wealth Report 2018, the "city wealth index" is drawn from four major indicators -- wealth, investments, lifestyle and future.
The report said the city ranked 16th among the top 20 costliest global cities where $1 million can buy only 92 square metres of area.
"Mumbai and Delhi would be among the top 10 markets to witness the highest addition in households earning more than $250,000 annually between 2017 and 2022," the report said.
It added that India would be the third-largest contributor in Asia with respect to wealthy population after China and Japan.
"The country's affluent class in the super prime (having more than $50 million ) category also grew by 21 per cent between 2016 and 2017," it added.
Around 95 per cent wealthy respondents in India said they increased their investments in equities, while 50 per cent said investments in property declined in 2017.
On the global front, the number of ultra-wealthy that is those with $50 million or more in net assets rose by 11,630 in 2017, taking the global total to 129,730, the report added.
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