Billionaire investor George Soros will partner with Mastercard Inc on a venture they said could help migrants, refugees and others struggling within their communities worldwide to improve their economic and social status. The partnership, Humanity Ventures, stems from a pledge Soros made in September to earmark up to $500 million for investments to address challenges facing migrants and refugees. In a joint statement on Thursday, Mastercard and Soros said that despite billions of dollars of humanitarian and development assistance, millions of people remain marginalized, a situation the private sector can help rectify.