消費，有時俗稱花錢、買東西等，係人類社會特有，指人類通過貨幣購買有形或無形商品或服務，並從中得到個人慾望滿足。人類消費活動或者係心血來潮（例如人們路過餐廳，挑起食慾），也可能對某些消費習以為常（例如一些家庭每天都買報紙），然而消費或者購買牽涉到非常複雜嘅決策過程，消費者根據佢嘅收入、個人喜好、社會習俗、甚至身邊朋友、家人購買行為對消費者本人產生影響。有部分消費本身係帶有“不可避免”性質嘅，例如購買食物解決溫飽問題；有部分消費則具有可選性，例如購買金銀首飾同私人汽車。如果被購買嘅係昂貴貨品，仲會驅使消費者作出貨品和替代品之間的比較，先會出現消費嘅行為。
Consumption, sometimes commonly known as spending money, buying things, etc., is unique to human society, and refers to the purchase of tangible or intangible goods or services by human beings through money, and obtaining personal desire satisfaction from it. Human consumption activities may be whims (e.g., people passing by restaurants, arousing their appetite), or they may be accustomed to certain consumption (e.g., some families buy newspapers every day), but consumption or purchase involves a very complex decision-making process, and consumers have an impact on consumers themselves according to their income, personal preferences, social customs, and even the purchasing behavior of friends and family. Some consumption itself is "unavoidable", such as buying food to meet the problem of food and clothing, while some consumption is optional, such as buying gold and silver jewelry and personal cars. If the purchase is of an expensive commodity, it will also drive consumers to make comparisons between the goods and the alternatives, and the consumption behavior will occur.