Apparently most people feel they need some kind of edge on others. That strikes me as very much in concert with what we see in our lives.
I wonder if Americans are more aggressive about winning, about that edge, than other cultures, and why this would be.
I know the time I've spent in France (part of the last few summers) has been an eye-opener, as the French tend to see Americans not only as aggressive, but as obsessed with quantifying.
They say we talk much more openly about money than Europeans do, and that the use of percentages to describe things (ie. 'a ten percent sale') is uniquely American.