14 May 2010 - Mike Foster So, where is the happiest place in the world? 'Supertrends', a new book by entrepreneur and author Lars Tvede, highlights why a well-run economy makes you happy, and what happens at the other end of the scale If you want to stay happy as fear and loathing grip the markets, it is probably best to head down Costa Rica way. According to a happiness index compiled by Ruut Veenhoven of the Erasmus University of Rotterdam [ chttp://bit.ly/cstl6z ] , Costa Rica, in central America, was the world's most joyful country during the noughties with an average score of 8.5, against an average of 5.8. According to a happiness index compiled by Ruut Veenhoven of the Erasmus University of Rotterdam [ c http://bit.ly/cstl6z ] , Costa Rica, in central America, was the world's most joyful country during the noughties with an average score of 8.5, against an average of 5.8. His findings draw on a range of surveys and opinion polls to reach its conclusions. Analys...