According to Jeffrey Sachs, the director of the Earth Institute, who co-edited the World Happiness Report with Richard Layard of the London School of Economics and John Helliwell of Canada's University of British Columbia, gains in GNP cannot alone promote happiness.
Potrivit lui Jeffrey Sachs, directorul Institutului Pământului, care a redactat Raportul Fericirii Modiale împreună cu Richard Layard de la Şcoala de Economie din Londra şi cu John Helliwell de la Universitatea British Columbia din Canada, doar progresele legate de PIB nu pot promova fericirea.