This paper investigates how social composition affects social conflict and economic development when property rights are unenforceable. It is shown that conflict prevents investment and growth in a society of symmetric groups.
Link
http://econpapers.repec.org/scripts/redir.pl?u=http%3A%2F%2Fwww.econ.ku.dk%2Fwpa%2Fpink%2F2005%2F0516.pdf;h=repec:kud:kuiedp:0516