Sweden is the fourth-most competitive economy in the world, according to the World Economic Forum in its ''Global Competitiveness Report 2012–2013''. Sweden is the top performing country in the 2014 ''Global Green Economy Index (GGEI)''. Sweden is ranked fourth in the IMD World Competitiveness Yearbook 2013. According to the book ''The Flight of the Creative Class'' by the US economist Professor Richard Florida of the University of Toronto, Sweden is ranked as having the best creativity in Europe for business and is predicted to become a talent magnet for the world's most purposeful workers. The book compiled an index to measure the kind of creativity it claims is most useful to business—talent, technology and tolerance.