A lot of the numbers people use to describe how people live are misleading. In poorer countries, organizational structures are flatter. You pay the owner of the chicken for the eggs. This leaves out the money for the factory workers, the truckers, the marketing, the grocery store (and all its hierarchies), and profits for the shareholders who perform no labor at all. This is monetary waste. This waste increases prices for the consumer.
This is true in a lot of countries outside the u.s. The food in the restaurant is cooked by the owner of the restaurant, not a wage earner. The efficiencies found by automation and commoditization of labor are lost in the waste of trickle down economics.
Another aspect of life in poorer areas of the world - including many areas of the united states - is the barter that occurs between many individuals. I'll mow your lawn if you paint my house. I have the mower, you have the ladder and the brushes.
This type of cooperation is lost in an individualistic society like the united states where everyone performs a role. The cashier, the delivery person, the accountant. In "poorer" societies, these roles are performed by a single person in many cases.
This division of labor has, rather than increased productivity and decreased cost, in fact increased cost due to monetary waste at each exchange. Listen to Noam Chomsky describe the "real Adam Smith" and how he believes the division of labor will destroy the individual through wage slavery. http://www.youtube.com/watch?v=ugq86q9KyPE I have not read "wealth of nations" myself, to verify Chomsky's opinion of Smith's work, but I have it on hold at the library and will soon.
Think of it like physics. Just as energy is lost when it changes form, money is lost when it changes hands. The more hands through which that money passes between the producer and the consumer, the more money is lost to waste.