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ARC ELASTICITY: The average elasticity for discrete changes in two variables, A and B. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of the initial and ending values of each variable, rather than only initial values. Arc elasticity is generally calculated using the midpoint formula. Arc elasticity should be compared with point elasticity. For infinitesimally small changes in variables A and B, arc elasticity is the same as point elasticity.

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STABLE EQUILIBRIUM

Equilibrium that is restored if disrupted by an external force. Most economic models have equilibrium that is stable, reflecting the observation that the real world adapts to changes and maintains a fair degree of stability. The alternative to a stable equilibrium is an unstable equilibrium.

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