Baumol endeavored to check this observationally and tracked down an extremely amazing connection between's a nations' result development throughout an extensive stretch of tin to 1979) and its underlying wealth.[12] His discoveries were subsequently challenged by De asserted that both the non-arbitrariness of the tested nations, and potential for critical esti blunders for assessments of genuine pay per capita in 1870, one-sided Baumol's discoverie infers that there is little proof to help the intermingling hypothesis.