> Wouldn't this result in exactly the global culture? A compromise by taking the “best” aspects from everyone

Yes-- that's exactly what we've done: mostly selecting for efficiency. And now we're so locked into a local optimum of efficiency, diversity in business culture and mainline economic practices is difficult.

> minimizing everyone's unhappiness from that?

While capital markets try to optimize return on investment, and happiness is one component of economic preference that drives ROI... they hardly try and optimize happiness, per se. They are also relatively short-sighted, don't foresee all consequences and externalities, and tend to fall into local rather than global optima.