Unlock the Editor’s Digest for freeRoula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter.A few years ago Ruffer was dubbed “50 Cent” for hoovering up Vix options priced at 50 cents — first making a mint in Volmageddon before amassing a $800mn haul when markets puked in 2020. Now it’s got a brand new bag.The £24bn UK investment company’s chair Jonathan Ruffer wrote in his latest letter to investors that it has a “big position” in the Japanese yen, arguing that it will move “violently”...