==Sources==*"Economics in Late Byzantine World," from Foundation of the Hellenic World http://www1.fhw.gr/chronos/10/en/o/oa/oa3.html*Warren T. Treadgold.
* "Economics in Late Byzantine World, " from Foundation of the Hellenic World http://www1.fhw.gr/chronos/10/en/o/oa/oa3.html* Warren T. Treadgold.