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Normal good
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=== Normal goods and consumer behaviour === The demand for normal goods are determined by many types of [[consumer behaviour]]. A rise in income leads to a change in consumer behaviour. When income increases, consumers are able to afford goods that they could not consume before an income rise. The purchasing power of consumers increases. In this situation, the demand rises because of the attractiveness to consumers. The goods are attractive to the consumers maybe because they are high in quality and functionality and also the goods may help to maintain a certain socio economic prestige. Individual consumers have unique behavioural characteristics and they have their preferences accordingly. According to economic theory, there must be at least one normal good in any given bundle of goods (i.e. not all goods can be inferior). Economic theory assumes that a [[Good (economics)|good]] always provides [[marginal utility]] (holding everything else equal). Therefore, if consumption of all goods decrease when income increases, the resulting consumption combination would fall short of the new budget constraint frontier.<ref name=":0">{{Cite book|last=Perloff|first= Jeffrey M. | title=Microeconomics| year=2015 | isbn=978-0133456912|edition=Seventh|location=Boston|oclc=876140973}}{{page needed|date=April 2019}}</ref> This would violate the economic rationality assumption. When the price of a normal good is zero, the demand is infinite.{{Citation needed|date=November 2024}}
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