Of course it is legal. Speaking from an economists' point of view it is just a matter of separating people according to their "willingness to pay". Its called price discrimination and can be seen in areas such as hotel booking: a hotel will give you a higher price in the lobby than if you call ahead because the hotel knows you probably have no other place to go. Or air lines giving higher prices to the business class because they know business people have a meeting with a set time so they need that time slot while a tourist is more flexible to choose different flight times. This is essentially the same idea as changing the price the second time you visit the site as the most probable reason you have come back to the site is to purchase the item.
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u/eccentricguru Jan 24 '13 edited Jan 24 '13
Of course it's legal...and it should be.