This research is a great example of using secondary research to find answers. This tactic is useful when the study has a low budget or when the initial research would simply be too time consuming. In this case, they used information from the Gallop World Poll and the International Monetary Fund. The researchers also asked some of their own questions, a crucial part of the experiment if you want to call the research your own.
Research Link: http://www.sciencedaily.com/releases/2012/12/121203082256.htm