US centered studies like this are so myopic that they are useless taken individually. https://www.piie.com/sites/default/files/documents/wp22-4.pdf https://www

US centered studies like this are so myopic that they are useless taken individually. https://www.piie.com/sites/default/files/documents/wp22-4.pdf https://www.piie.com/sites/default/files/documents/wp22-4.pd... When Europeans make these studies–especially from smaller countries–they make cross country comparisons as a rule. These comparisons makes it possible to separate national policy from other effects. Almost everything is multicausal in social sciences, separating the possible effect of different factors makes studies worthwhile.