@Henrik phil,
I agree with the laws that protect us from the mistakes of others, not with those that protect us from our own mistakes.
It is not false, the reasons why the efficiency is greater are similar, such as the use of less material on construction to achieve the same capacity, possibility of using bigger as well transports to bring in and out whatever has to be brought in or out, easier organization, etc. Off course there are limitations to how concentrated one thing can be winhout losing efficiency instead of gaining, but if these limitations are superated with, for example, invention of new materials, concentration becomes worthwhile again.
Wages differ due to politic, cultural and social reasons, the economy system itself is not a cause of it, even if it was created because of it.