Externality: a cost or benefit caused by an activity that affects other parties but is not taken into consideration (e.g. by being reflected in purchase prices)
Hidden cost: a cost not included in the purchase price, such as additional expenses, opportunity costs, or externalities
Social Cost: an expense to society that is the sum of the private costs paid by a firm or individual, and the externalities paid by other parties
Reducetarianism: the practice of eating less meat (& dairy, eggs, & other animal products), which may be appealing because not everyone is able or willing to follow a completely meat-free diet.