In intergroup affairs, therefore, the relations sooner become impersonal and mechanical.
Intragroup money from property; intergroup money from trade.
These cases already show us the distinction between intragroup money and intergroup money.
As a rule, the outcome of episodes of intergroup competition is geographic exclusion.
Here the effect of intergroup trade has been to change the skin which was taken as the unit.
Thus group money arose from property; intergroup money from trade.