Tesla’s Elon Musk tweeted “You can now buy a Tesla with bitcoin” and added that the bitcoin earned though sales will not be converted into traditional currency. The buying option will be available outside the USA later this year. Tesla, last month, had bought $1.5 bn of bitcoin and said that it would soon accept it as a form of payment for cars. Musk, last month, had criticised conventional cash, saying when it “has a negative real interest, only a fool wouldn’t look elsewhere.”