It is common in economics, though not necessary or universal, to use Greek letters to represent various elasticities. Below are common ways of writing elasticities in economics:

(epsilon) or less common (eta) -- Own price elasticity of demand:

change in desired quantity demanded, due to a change in market price.

or less common -- Cross price elasticity of demand:

change in desired quantity demanded of X, due to a change in market price of Z.

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