I love the observation of eastern culture being interdependent (seems to track really well in my mind), but the characterization of western culture as independent is interesting because of how differently independence is interpreted in the US vs Europe.
US culture highly values the idea of the self-made man and the American Dream. In that respect, independence looks like having enough drive and luck to be able to financially support yourself and your family in a society that's generally unforgiving (weak safety sets, unaffordable education, employment-tied healthcare, etc). That's the self-made "pick yourself up by your bootstraps" (which is an oxymoron) part of the culture where most "successful" people are always preoccupied with talking about what they have going on and how busy they are.
But how many evaluate others is based on the other side of that equation -- the American Dream. The house, the car. Conspicuous consumption is rampant in the US. Holidays are sales events before anything else, and everything and everyone is a billboard opportunity. So for those who have made it, there's often a desire to mark the milestone or look the part. And especially for those who haven't made it, status symbols still offer a social shortcut to proxy a certain image.
The numbers support this -- Rolex has 30% of the Swiss market share globally, but 40% of the Swiss market share in the U.S. Of course, us crunchers are enlightened enthusiasts immune to social pressures, but for everyone else, there's a submariner at the AD waiting for your wrist (demo model, not for sale).