This study documented conclusively that America's Government is the latter.
So, on 14 April 2014, I headlined "US Is an Oligarchy, Not a Democracy, Says Scientific Study". Subsequently, my editor linked it to the published article at the Journal where the study was published, Perspectives on Politics, from the American Political Science Association, and the full study can be read there.
On 30 April 2014, was posted at youtube the video that remains, to this day, the best and clearest ordinary-language summary of what that badly-written academic study proved. See its explanation here:
Read more at http://www.zerohedge.com/news/2017-12-22/zuesse-americans-are-only-now-beginning-learn-they-live-dictatorship