The argument actually was that the extreme area offered by Europe and Asia being situated along a large e-w oriented latitude offered both a wide variety of domesticated plant species as well as a greater area to grow them. So a crop domesticated in W Europe could much more easily be traded as there are more markets and arable land.
Africa, oriented N-S has a huge variation in climates from the Med in the North through the Serengheti, the sahel, the savannah, tropical rainforests, the veldt, and etc. A lot more micro-climates that make transferring crops to a different area problematic. There were some other reasons but this was the basis of his geographical argument.
Africa, oriented N-S has a huge variation in climates from the Med in the North through the Serengheti, the sahel, the savannah, tropical rainforests, the veldt, and etc. A lot more micro-climates that make transferring crops to a different area problematic. There were some other reasons but this was the basis of his geographical argument.