The bottom half of the world’s population owns the same as the richest 85 people in the world.[1](p2 bottom)
See the difference? The richest 85 people have about $1.7 trillion in wealth[2]. To put that in perspective the world stock market capitalization is $63 trillion[3], world bond market capitalization is around $100 trillion[4], world investment grade real estate $26 trillion[5]. That already $189 trillion of world wealth and ignores most real estate, commodities, durables, government owned assets, etc. So the richest 85 people actually own much less than 1% of the world's wealth. The problem is that the bottom 50% also own much less than 1% of the world's wealth.
You will have a very hard time solving the world's problems if you can't even get basic facts straight. Gates, the world's second richest man, could give his entire fortune away to the bottom 50% and they would only get $19.00 each (=$67B/3.5B). Of course he would then have to shut down the Gates Foundation.
[1] http://www.oxfam.org/sites/www.oxfam.org/files/bp-working-fo...
[2] http://www.forbes.com/billionaires/list/
[3] http://www.businessinsider.com/wfe-world-stock-market-capita...
[4] http://www.bis.org/publ/qtrpdf/r_qt1212h.pdf
[5] http://www.investmentmanagement.prudential.com/documents/pim...