Exceptions to the Law of Demand:
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As we have said above, generally the demand curve slops downwards from right to left. But sometimes the demand curve, instead of sloping downward, will rise upwards. In other words, sometimes people will buy more when the price rises. Such cases are very rare. The following is the list of few exceptions to the law of demand.

Veblen Effect:
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Veblen has pointed out that there are some goods demanded by very rich people for their social prestige. When price of such goods rise, their use becomes more attractive and they are purchased in larger quantities. For example, demand for diamonds from the richer class will go up if there is increase in price. If such goods were cheaper, the rich would not even purchase.