This isn’t the kind of race countries aspire to win. The London Olympic Games are on track to become the most expensive since the 1996 summer competition in Atlanta, said researchers at the University of Oxford. The final price tag may set the British capital city back twice what organizers originally estimated. A spokesman for the Games did not comment on the study. When London placed its bid to host the Olympics, organizers estimated that it would cost the city about £4.2 billion to secure the international sporting event. Several years later, it looks like that amount may have risen to about £8.4 billion.