Caste System when the GLib and a bunch of scientists provide you with plenty of GPP as it is.
i see... but if you have a very VERY big empire in the early days 1000 BC (immortal rush gone crazy) you can use the unlimited Mechants to hold the strike at bay...
ill set this up:
10 AD
19 citys
Persia - Cyrus
huuuge need of money....