Another way to define a normal good is by calculating its income elasticity of demand. If this coefficient is positive and lower than 1, the good is considered to be a normal good.
In most circumstances, as the income of an economy increases, there is an increase in the demand for goods and services. One example might be luxury cars; as the income level increases, more people buy or demand these cars.
However, when income rises, demand for some goods and services may be negatively affected. For example, as the income level increases, fewer people might use the public transportation system. In this case, the bus or train would be considered an inferior good or service because its demand has gone down.
Investment dictionary. Academic. 2012.
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