Charlie Stross says emergent corporate entities control America. Krugman says wealth alone is sufficient explanation, emergent entities are an unnecessary complication.
John Gordon says control (the bouncing yellow ball) of America is a dynamic balance between the emergent corporate entity (ECE) powerful (wealthy) individuals, and the voting masses :
Of course I'm right, but it would be nice to have evidence.
Fortunately, there's a natural experiment coming up. The GOP is threatening to destroy the American, and world, economy. This is in the interests of neither powerful individuals nor ECEs. So if it happens, then Stross, Krugman and I are all wrong. The Voters have power after all, and it's just too bad so many Americans are detached from reality.
I bet, however, that the Tea Party GOP caves, and the GOP that serves the powerful and the corporate wins.
That doesn't tell us whether Stross, Krugman, or me has the best story though. We need a different falsifiable prediction.
It's tough to come up with that test because this is a triangle of frenemies, not enemies. Often the interests of (hypothetical) ECEs align with those of powerful people and/or Voters (who are both consumers and employees). We need test where the voters are neutral, but the interests of corporate entities and powerful individuals are opposed.
The only test I've come up with so far would be to examine the pattern of legislation over the past 30 years. My hypothesis is that we'd find that legislation and accounting regulations have furthered the development of ECEs even as they've reduced the rate of return to Powerful individuals -- perhaps shrinking that pool  and even reducing overall economic growth.
Can anyone think of another falsifiable test?
 Similar picture here, but there the third point was "the weak". Also true, but different point.
 So we end up with fewer "players", even though they may be individually wealthier.