The balanced nuclear equation for the decay of radon-220 by α decay is 
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Definitions:
Income Elasticity
A measure of how much the quantity demanded of a good responds to a change in consumers' income, holding all other factors constant.
Expenditures Decline
A situation where there is a reduction in spending by individuals, businesses, or governments.
Elastic Demand
A condition where the demand for a product is significantly responsive to changes in its price.
Inelastic Demand
Describes a situation in which the demand for a product does not significantly change with a change in price.
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