(Bloomberg) — Just weeks after a buzzy trading debut, Klarna Group Plc shares fell below the initial public offering price for the first time in the face of increased competition from rivals and worries about the path of interest rates. Most Read from Bloomberg The digital-payments firm’s stock fell to $39 Friday, closing below the $40 listing price. Klarna started trading on Sept. 10 after the company and some of its backers raised about $1.58 billion in an offering that was double-digit oversubscribed ...