Where does dependence collide?

The property that two random quantities are not independent: knowing the value of one changes the probabilities you assign to the other, so their joint distribution does not factor into the product of the two separate distributions. Lehmann's 1966 Some Concepts of Dependence formalised several ways this can happen, from simple linear correlation to stronger orderings such as positive quadrant dependence, and showed they are not the same thing. The referent here is a mathematical relationship between variables, present or absent by degree, and it has nothing to do with an organisation needing resources, a body adapting to a drug, or a nation tied to a richer economy.[1]

Unit

A relationship between two random variables, present by degree

Recovery means

Not applicable

Measured by

Detected and scaled by correlation coefficients, mutual information, or tests against the hypothesis of independence

The condition in which an organisation must obtain resources it does not control, such as money, materials, or approval, from other actors in its environment, which gives those actors leverage over its choices. Pfeffer and Salancik's 1978 book The External Control of Organizations built resource dependence theory on this idea, arguing that firms manage such reliance through tactics like mergers, alliances, and board appointments to reduce the power others hold over them. The referent is a relationship of need and power between organisations, not a numerical link between variables, a physiological adaptation, or a structural tie between national economies.[5][2]

Unit

An organisation's reliance on an external supplier of a critical resource

Recovery means

An organisation can reduce it by diversifying suppliers, integrating, or forming alliances

Measured by

Assessed through the concentration and criticality of resource providers and the ties an organisation forms to manage them

The body's adaptation to a repeatedly taken drug, shown by tolerance, meaning larger doses are needed for the same effect, and by a withdrawal state when the drug is stopped. O'Brien, Volkow, and Li's 2006 paper What's in a Word? Addiction Versus Dependence in DSM-V argued that this physical adaptation is a normal, expected response that can occur even in a patient taking a medicine as prescribed, and should be kept separate from addiction, the compulsive drug-seeking that marks the disorder. The referent is a measurable change in how a body responds to a substance, unlike a statistical link between variables, an organisation's reliance on resources, or a nation's tie to the world economy.[3]

Unit

A body's adapted response to a drug, marked by tolerance and withdrawal

Recovery means

Resolves through medically supervised tapering as the body readjusts to the drug's absence

Measured by

Identified clinically by rising tolerance and a characteristic withdrawal syndrome on cessation

In dependency theory, the structural condition in which the economies of poorer, peripheral countries are shaped by, and constrained by, their links to wealthier, core economies, so that growth in the periphery follows the needs of the core. Cardoso and Faletto's 1979 Dependency and Development in Latin America developed this account, treating dependence not as a fixed trap but as a historical relationship that varied across countries and periods. The referent is a structural relationship between national economies, offered here as one scholarly framework among several and stated without political endorsement; it is distinct from a statistical link, an organisation's resource reliance, or a body's adaptation to a drug.[4]

Unit

A national economy's structural reliance on wealthier core economies

Recovery means

Debated within the framework, tied to changes in a country's position in the world economy

Measured by

Analysed through trade composition, foreign investment and debt patterns, and the historical study of a country's economic ties