French businessman and investor Bernard Arnault retained his position as the world's richest man on Forbes' billionaires list this year, increasing his lead on social media and ecommerce behemoths Elon Musk, Jeff Bezos and Mark Zuckerberg to amass a staggering £233billion fortune. Bernard Arnault $233billion - LVMH Empire Bernard Arnault, now 75, became the world's richest man last year after …