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The major determinant of the YED is first,
if the good is a normal good or it's an inferior good,
and second, if it is a normal good usually,
then how necessary is it... is it.
The income elasticity of demand is an important concept
to firms considering the future size
of the market for their product.
You know if the product has high elasticity of income,
sorry income elasticity of demand,
sales are likely to expand rapidly
as national income rises but may also fall significantly
if the economy moves into a recession.
So it is kind of important for the CEO to be planning.