Short answers, pulled from the story.
A market in economics is a coordinating mechanism that uses prices to convey information among economic entities such as firms, households, and individuals to regulate production and distribution. Markets allow any tradeable item to be evaluated and priced. They differ from firms, which eliminate price signals and instead use an entrepreneur-coordinator to direct production.
In his 1937 article "The Nature of the Firm", Ronald Coase argued that markets and firms are two opposite forms of organizing production. Outside firms, price movements direct production through exchange transactions; inside firms, the price mechanism is replaced by an entrepreneur-coordinator. Coase identified using the price mechanism as the defining feature of the market.
The Kula ring is a system of inter-tribal exchange traced by Bronislaw Malinowski across the Trobriand Islands in his 1922 book Argonauts of the Western Pacific. Necklaces of red shells travel clockwise around the circuit and bracelets of white shell travel anticlockwise. The exchange is rooted in myth, backed by traditional law, conducted ceremonially at fixed dates along fixed trade routes, and sustained by lifelong partnerships between participants from tribes of different language and culture.
Alfred Marshall, in his Principles of Economics published in 1890, presented the supply and demand model as a solution to the debate between labor and subjective theories of value. He derived demand curves by aggregating individual consumer preferences and supply curves from firm production costs, with market equilibrium at their intersection. He also introduced the distinction between the long run and the short run, and his framework gave rise to the theory of perfect competition.
"The Market for Lemons" is a 1970 paper by George Akerlof examining how information asymmetry destroys markets. When sellers of used cars know more about quality than buyers do, buyers offer only average prices; sellers of good cars withdraw; and the market fills with bad cars. This analysis became a foundational study of market failure and was central to a broader turn toward information economics in the 1970s alongside work by Michael Spence and Joseph Stiglitz.
The United Nations estimated the value of the global illicit drug market in 2003 at US$13 billion at the production level, US$94 billion at the wholesale level after accounting for seizures, and US$322 billion at the retail level based on retail prices and losses. The large gap between production and retail values reflects the layered distribution structure and risk premiums built into illegal supply chains.