The Diderot Effect states that obtaining a new possession often creates a spiral of consumption that leads to additional purchases.Diderot noticed this effect when he upgraded his scarlet robe and felt the urge to improve his other possessions as well.This pattern can be seen in everyday life when buying one item leads to the need for additional purchases to match or improve the new possession.For example, buying a dress may lead to the need for new shoes and accessories to complete the outfit.