This paper investigates monopolist sales strategies, especially a clearance sales strategy in which the firm keeps unsold products in stock and sells them at a discounted price in the next period. I focus on the effect of new product introduction on consumer behavior by using a durable-goods monopolist model with demand uncertainty. The result shows that without the introduction of new versions of products, clearance sales never occur. On the contrary, when new versions of products are released, clearance sales strategy can be used, when the excess supply is not expected to be that large. It is shown that new product introduction and replacement behavior play an important role in clearance sales strategy.

本文研究了垄断者的销售策略，尤其是清仓销售策略，在该策略中，公司保留未售产品的库存，并在下一个时期以折扣价出售它们。我通过使用具有需求不确定性的耐用品垄断者模型来关注新产品推出对消费者行为的影响。结果表明，如果不引入新版本的产品，就不会发生清仓销售。相反，当发布新版本的产品时，可以使用清仓销售策略，而预计多余的供应量不会那么大。结果表明，新产品的引入和替换行为在清仓销售策略中起着重要作用。