The report shows the wealth of the 1 per cent richest people in the world is worth about $US110 trillion, 65 times the total wealth of the bottom half of the world's population.

It also shows the world's richest 85 people control about $US1.7 trillion in wealth, equivalent to the bottom half of the world's population.

And far from hindering the wealthy, the political response to the global financial crisis - including the actions of central banks and the austerity measures introduced by national governments - has made the rich fabulously richer.

In the US, the wealthiest 1 per cent of the population grabbed 95 per cent of post-financial crisis growth between 2009 and 2012, while the bottom 90 per cent became poorer.

But an Oxfam survey of six countries - the United States, UK, Spain, Brazil, India and South Africa - has found that the majority of people believe laws and regulations are skewed in favour of the rich, so people are noticing.