Which of the following is definition of elasticity of demand in microeconomics?

Elasticity refers to the responsiveness of quantity demanded or quantity supplied to a change in price or another factor:

The price of a product can be described as being elastic if a small change in price leads to a big change in demand.

The price of a product can be described as being inelastic if a big change in price leads to a small change in demand.

The formulae of elasticity of demand is known as the following:

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