The idea that resources might be more of an economic curse than a blessing began to emerge in debates in the 1950s and 1960s about the economic problems of low and middle-income countries. However in 1711 "The Spectator" wrote "It is generally observed, that in countries of the greatest plenty there is the poorest living", so this was not a completely new observation. The term "resource curse" was first used by Richard Auty in 1993 to describe how countries rich in mineral resources were unable to use that wealth to boost their economies and how, counter-intuitively, these countries had lower economic growth than countries without an abundance of natural resources. An influential study by Jeffrey Sachs and Andrew Warner found a strong correlation between natural resource abundance and poor economic growth. Hundreds of studies have now evaluated the effects of resource wealth on a wide range of economic outcomes, and offered many explanations for how, why, and when a resource curse is likely to occur. While "the lottery analogy has value but also has shortcomings", many observers have likened the resource curse to the difficulties that befall lottery winners who struggle to manage the complex side-effects of newfound wealth.