> Tax receipts as percentage of GDP have been remarkably stable over time
That may be true, but since the sources you listed contradict each other, I'm left confused. I can find supporting evidence of the graph[1], but not of the wikipedia entry. The world bank apparently thinks they are all wrong[2]. Then there's a report that Norway is actually doing it with much less taxes than Denmark and Sweden[3], but that might be likely due to oil revenue. I'm left to conlcude that without a lot of research to look into the specifics, there's quite a few ways to measure this, and I'm not sure which are most relevant to the discussion at hand.
That may be true, but since the sources you listed contradict each other, I'm left confused. I can find supporting evidence of the graph[1], but not of the wikipedia entry. The world bank apparently thinks they are all wrong[2]. Then there's a report that Norway is actually doing it with much less taxes than Denmark and Sweden[3], but that might be likely due to oil revenue. I'm left to conlcude that without a lot of research to look into the specifics, there's quite a few ways to measure this, and I'm not sure which are most relevant to the discussion at hand.
1: http://www.taxpolicycenter.org/statistics/source-revenue-sha...
2: http://data.worldbank.org/indicator/GC.TAX.TOTL.GD.ZS
3: http://www.thelocal.no/20151204/norway-leading-the-field-for...