I don't agree with the notion that the existence of a few mega-corps is a useful metric. Of course the US is the more free market, and allows those oligopolies to exist. The EU would have split up those companies years ago.
PPP statistics don't account for the lower value of ersatz products/services. They artificially equate the value of product/service suites across countries, instead of relying on market price signals to gauge value.
That is definitely one measure, but it is also an economy where someone working at the restaurant in a hotel in Miami earns about one bottle of water per hour. If the bottled water is expensive or if the salary is low is a matter of perspective.
