luxuriant adj
1. marked by complexity and richness of detail; "an elaborate lace pattern" [syn: elaborate]
2. produced or growing in extreme abundance; "their riotous blooming" [syn: exuberant, lush, profuse, riotous]

Luxuriant \Lux*u"ri*ant\, a. [L. luxurians, p. pr. of luxuriare: cf. F. luxuriant. See Luxuriate.] Exuberant in growth; rank; excessive; very abundant; as, a luxuriant growth of grass; luxuriant foliage. Prune the luxuriant, the uncouth refine. --Pope. Luxuriant flower (Bot.), one in which the floral envelopes are overdeveloped at the expense of the essential organs.

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In economics, a luxury good is a good for which demand increases more than proportionally as income rises, and is a contrast to a "necessity good", for which demand is not related to income.

Luxury goods are said to have high income elasticity of demand: as people become wealthier, they will buy more and more of the luxury good. This also means, however, that should there be a decline in income its demand will drop. Income elasticity of demand is not constant with respect to income, and may change sign at different levels of income. That is to say, a luxury good may become a normal good or even an inferior good at different income levels, e.g. a wealthy person stops buying increasing numbers of luxury cars for his automobile collection to start collecting airplanes (at such an income level, the luxury car would become an inferior good).

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