A good that is both a Giffen good and a Veblen good.
Goods you were already consuming becoming more valuable to you does not cause your purchasing power to increase.
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what else could purchasing power possibly mean?
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Ability to purchase goods. This goes down if price goes up.
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Or ability to purchase goods weighted by how valuable the goods are.
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One might think this stays constant if price and value of goods rise proportionally, but increases in value of conspicuous consumption goods typically is relative to the value of substitutes, and ability to extract value from goods in general does not increase along with price.
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Anyway, the point is, if you keep buying a good whose price has risen, you have less money left over to spend on other goods, and the fact that the good's value to you has increased does not change this.
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but that's not all that's necessary for a giffen good. it has to price you out of substitutes
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hard to see how that would happen with a veblen good, because as it goes up in price you need proportionally less for the same effect
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prototypical giffen good is rice. imagine rice whose caloric content was proportional to its price
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