Volkswagen Group (VW) and Tesla rival Rivian have launched a joint venture, with the German car giant increasing its investment in the partnership. The two companies say the the deal is now worth $5.8bn (£4.55bn) – up from an initial pledge of $5bn by VW. Shares in the US electric vehicle (EV) maker jumped more than 9% in after-hours trading following the announcement. The tie-up will see the firms sharing