chicken-and-egg
UK[ˌtʃɪk.ən.əndˈeɡ]US[ˌtʃɪk.ən.əndˈeɡ]
adj
Describing a situation where it is impossible to decide which of two things happened first or caused the other.
n
A situation of the type described above.
Etymology
The phrase originates from the ancient philosophical paradox concerning causality and origins, famously discussed by classical thinkers like Plutarch and Macrobius. The specific English formulation "chicken and egg" became a standard proverbial expression by the 18th century. In the 20th century, this proverbial puzzle was lexicalized into a hyphenated compound adjective and noun, moving from a metaphorical riddle to a technical term used in discussions of circular causality in fields like biology, economics, and systems theory. It now concisely denotes any situation where two interdependent factors make it impossible to determine primary causation.
Analysis
This is a fixed compound phrase derived from the long-standing philosophical and proverbial puzzle: "Which came first, the chicken or the egg?" It functions as a single lexical unit. The morphemes 'chicken', 'and', and 'egg' are all English words of Old English origin, but their combination creates an idiomatic meaning distinct from the sum of its parts.
Examples
It's a chicken-and-egg problem: does poor management cause low morale, or does low morale lead to poor management?
Researchers are stuck in a chicken-and-egg debate over whether the genetic mutation or the environmental trigger is the initial cause.
The relationship between technology and social change is often chicken-and-egg.