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(.70). No matter how you slice it,[link widoczny dla zalogowanych], wealthier states have more passport holders. It's also reasonable to assume that more highly educated people would be more likely to hold a passport. And that too is what we find across the states. There is a considerable correlation (.80) between passports and human capital levels (measured as the percentage of a population with a bachelor's degree or higher). What's really striking is that this correlation holds even when we control for income, using a statistical procedure called partial correlation analysis. Passport holding also reflects the structure of state economies. There is a substantial correlation (.70) between the percentage of passport holders and the percentage of the workforce in knowledge-based and creative jobs. Conversely, there is significant negative correlation between passport holders and the share of the workforce in blue-collar working class jobs (-.82). Working class states have considerably less passport holders than creative