Dec 10th 2007 From Economist.com ONE of this year's must-have Christmas gifts is a Nintendo Wii video-game console. And, just like Bratz or Cabbage Patch dolls in past years, it is proving hard to find. On Friday December 7th Nintendo announced it may even stop TV advertising in Britain until 2008 because it cannot meet demand. In September worldwide sales of the lower-priced Wii overtook Microsoft's Xbox 360. But the Wii's lack of high-resolution graphics may eventually dent its desirability. By 2011 Sony's PlayStation 3 is forecast to catch up with the Wii, according to Screen Digest, a consultancy.