Wealth is the abundance of valuable financial assets or physical possessions which can be converted into a form that can be used for transactions. This includes the core meaning as held in the originating Old English word weal, which is from an Indo-European word stem. The modern concept of wealth is of significance in all areas of economics, and clearly so for growth economics and development economics, yet the meaning of wealth is context-dependent. A person possessing a substantial net worth is known as wealthy. Net worth is defined as the current value of one's assets less liabilities (excluding the principal in trust accounts).

At the most general level, economists may define wealth as "the total of anything of value" that captures both the subjective nature of the idea and the idea that it is not a fixed or static concept. Various definitions and concepts of wealth have been asserted by various people in different contexts. Defining wealth can be a normative process with various ethical implications, since often wealth maximization is seen as a goal or is thought to be a normative principle of its own. A community, region or country that possesses an abundance of such possessions or resources to the benefit of the common good is known as wealthy.

The United Nations definition of inclusive wealth is a monetary measure which includes the sum of natural, human, and physical assets. Natural capital includes land, forests, energy resources, and minerals. Human capital is the population's education and skills. Physical (or "manufactured") capital includes such things as machinery, buildings, and infrastructure.

Around 35,000 years ago Homo sapiens groups began to adopt a more settled lifestyle, as evidenced by cave drawings, burial sites, and decorative objects. Around this time, humans began trading burial-site tools and developed trade networks, resulting in a hunter-gatherer lifestyle. Those who had gathered abundant burial-site tools, weapons, baskets, and food, were considered part of the wealthy.^{[need quotation to verify]}

Adam Smith, in his seminal work The Wealth of Nations, described wealth as "the annual produce of the land and labor of the society". This "produce" is, at its simplest, a good or service which satisfies human needs, and wants of utility.

In popular usage, wealth can be described as an abundance of items of economic value, or the state of controlling or possessing such items, usually in the form of money, real estate and personal property. A person considered wealthy, affluent, or rich is someone who has accumulated substantial wealth relative to others in their society or reference group.

In economics, net worth refers to the value of assets owned minus the value of liabilities owed at a point in time. Wealth can be categorized into three principal categories: personal property, including homes or automobiles; monetary savings, such as the accumulation of past income; and the capital wealth of income producing assets, including real estate, stocks, bonds, and businesses. All these delineations make wealth an especially important part of social stratification. Wealth provides some people "safety nets" of protection against unforeseen declines in their living standard in the event of emergency and can be transformed into home ownership, business ownership, or college education by its expenditure.

Wealth has been defined as a collection of things limited in supply, transferable, and useful in satisfying human desires. Scarcity is a fundamental factor for wealth. When a desirable or valuable commodity (transferable good or skill) is abundantly available to everyone, the owner of the commodity will possess no potential for wealth. When a valuable or desirable commodity is in scarce supply, the owner of the commodity will possess great potential for wealth.