1) The USA's economy is "financialized" to a much greater extent than Europe's.
2) Lots of "phantom" GDP in USA which makes US "productivity" and per-capita GDP look higher than corresponding Europe figures (it's not an "apples to apples comparison"), thereby hiding US economy's weaknesses (e.g., high college tuition costs, health insurance costs, high healthcare costs (paid out by insurance companies to hospitals), doctor liability insurance etc all inflate the GDP but the corresponding figures for Europe are smaller).
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My uneducated two cents:
1) The USA's economy is "financialized" to a much greater extent than Europe's.
2) Lots of "phantom" GDP in USA which makes US "productivity" and per-capita GDP look higher than corresponding Europe figures (it's not an "apples to apples comparison"), thereby hiding US economy's weaknesses (e.g., high college tuition costs, health insurance costs, high healthcare costs (paid out by insurance companies to hospitals), doctor liability insurance etc all inflate the GDP but the corresponding figures for Europe are smaller).