Critics such as Jeffrey Sachs have contested the Index's assumption that economic openness necessarily leads to better growth. In his book "The End of Poverty", Sachs graphed countries' ratings on the index against GDP per capita growth between 1995 and 2003, claiming to demonstrate no correlation between a country's rating and its rate of economic growth. Sachs pointed out, as examples, that countries with good ratings such as Switzerland and Uruguay had sluggish economic performances, others, like China, with poorer rating had very strong economic growth.