This pricing strategy is based on the assumption that travelers demand becomes less elastic as the departure date approaches.
Price elasticity of demand measures the responsiveness of quantity demanded to changes in price of the good.
Price elasticity of demand = percentage change in quantity demanded / percentage change in price
The more elastic demand is, the greater the quantity demanded of a good would be sensitive to price. All things being equal, it is expected that there should be a negative relationship between the price of a good and the quantity demanded.
The longer the time period, the more elastic demand is. This is because there would be enough time to search for suitable alternatives.
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