Besides, there are just nine women among the world's 62 richest persons, whose total wealth has increased by more than half a trillion dollars to USD 1.76 trillion since 2010.
The study, titled 'An Economy for the 1 per cent' and conducted by rights group Oxfam, also showed that the wealth of the poorest half of the world's population has fallen by a trillion dollars since 2010, a drop of 41 per cent.
Released here ahead of the five-day World Economic Forum's Annual Meeting beginning tomorrow, the survey showed that the number of people whose wealth is equal to that of the poorest half of the world's population stood at 388 in 2010.
Since then, it has been continuously declining and stood at 177 in the year 2011, 159 in 2012, 92 in 2013 and 80 in 2014.
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Talking about the income inequality in various countries, the study cited that India's top IT firm CEO makes 416 times the salary of a typical employee there, while that of the largest cigarette manufacturer gets 439 times the median staff salary.
At the same time, the report praised regulatory efforts in India mandating greater disclosures in this regard.
The report also highlighted that patient groups, other
civil society organisations and the government in India have challenged the influence of big global pharma players, prioritising access to medicines for citizens.
Oxfam called for urgent action to tackle the extreme inequality saying it "threatens to undermine the progress made in tackling poverty during the last quarter of a century".
Globally, it is estimated that a total of USD 7.6 trillion of individuals' wealth sits offshore. If tax were paid on the income that this wealth generates, an extra USD 190 billion would be available to governments every year.
Oxfam International Executive Director Winnie Byanyima, who was WEF Annual Meeting's Co-Chair last year and is also attending the 2016 summit, said it is "unacceptable that the poorest half of the world's population owns no more than a few dozen super-rich people who could fit onto one bus".
Corporate investment in tax havens almost quadrupled between 2000 and 2014.
The findings of the survey are expected to be widely discussed at the WEF meetings being attended by over 2,500 leaders from across the world including over 100 from India.