We trace the development of ideas about the relation of mood to social rank and territory. We suggest that elevated mood enabled a person to rise in rank and cope with the increased activities and responsibilities of a leadership role. while depressed mood enabled a person to accept low rank and to forego the rewards associated with high rank. This led to the concept of a trio of agon... https://chefesquipmenters.shop/product-category/deep-fryer-oil-filtration-machines/