[mrsmith]

Divide it into producing wealth (manufacturing) and servicing it's production (services). Farms and factories are both manufacturers who need services. GM or a farm pays for insurers (the insurers do not pay for GM or the farm).

Everybody needs everybody but it is the manufacturer who pays- out of the wealth he produces. In extremis, no manufacturing = no pay for services. And this producer economy of manufacturers supports the consumer economy. Or government taxes and borrows wealth to support it like we do now.

[expat_panama]

...it is the manufacturer who pays- out of the wealth he produces...

Right.  --and when you need medical aid you're suddenly not concerned with all that true (oh goodness!!) w e a l t h (oooohh) that comes only from the factory and you gladly swap all those say, TV sets for some of those puny mere services (yeach spit) that the doctor creates so you don't die.