A new analysis shows the world’s top 300 richest people became even richer last year, increasing their collective net worth by more than half a trillion dollars. According to the Bloomberg Billionaires Index, the aggregate net worth of the world’s leading billionaires was $3.7 trillion at the end of 2013. Bill Gates, the world’s richest person, saw his fortune increase to $78.5 billion. Gambling magnate and right-wing donor Sheldon Adelson added more than $14 billion to his fortune last year.