INFJs tend to see helping others as their purpose in life, but while people with this personality type can be found engaging rescue efforts and doing charity work, their real passion is to get to the heart of the issue so that people need not be rescued at all.
Cross elasticity of demand Cross elasticity of demand (XED) is the responsiveness of demand for one product to a change in the price of another product. Many products are related, and XED indicates just how they are related.
Demand for a good is said to be price elastic if the elasticity measure is greater than one in absolute value and inelastic if less than one. The cross-price elasticity of demand measures the proportionate change in the quantity demanded of one good to the proportionate price change of another good. A positive cross-price elasticity indicates that the goods are substitutes for one another; a negative cross price elasticity indicates the goods are complements.