In its final stage, Ancient Egypt kept its economy thriving through the mass trade in animal mummies which were garnered by factory farming. https://s3.amazonaws.com/academia.edu.documents/42893594/Ikram_2015_Role_of_Animal_Cults_Ancient_Egypt_Economy.pdf?AWSAccessKeyId=AKIAIWOWYYGZ2Y53UL3A&Expires=1523273338&Signature=9MLG5g4h%2BGioHoCblRj6HjTYfJM%3D&response-content-disposition=inline%3B%20filename%3D2015._Speculations_on_the_Role_of_Animal.pdf … http://www.oxfordhandbooks.com/view/10.1093/oxfordhb/9780199686476.001.0001/oxfordhb-9780199686476-e-30 …pic.twitter.com/zZJWGxDDqb