the elasticity of demand for an item is determined in part by the question
Demand PED is a measure of the sensitivity of the quantity variable, Q, to changes in the price variable, P. Elasticity answers the question of the percent by which the quantity demanded will change relative to (divided by) a given percentage change in the price. For infinitesimal changes the formula for calculating PED is the absolute value of (∂Q/∂P)×(P/Q).
Necessary and Proper Clause The Necessary and Proper Clause, also known as the elastic clause,[1] is a clause in Article I, Section 8 of the United States Constitution that is as follows: