【中文版】

单价优先原则是指在制定价格时，将商品的单价放在优先位置进行考虑的原则。通常来说，商品的单价越低，其销售量就会越高，因此，在制定价格时，需要首先考虑商品的单价，然后再考虑其他因素。

单价优先原则的优点在于它能够让消费者更容易接受商品的价格，从而促进销售量的提高。此外，如果企业能够通过降低商品的单价来提高销售量，那么企业的销售额也会相应增加，这有助于提高企业的竞争力。

然而，单价优先原则也存在一些缺点。首先，如果企业只是一味地降低商品的单价，而忽略了其他因素的影响，那么企业的利润可能会受到影响。其次，如果企业只是为了提高销售量而降低商品的单价，而没有考虑到市场需求和竞争环境等因素，那么企业的经营策略可能会受到影响。

因此，在制定价格时，企业需要综合考虑多种因素，包括商品的单价、市场需求、竞争环境等。只有综合考虑这些因素，才能制定出更加合理、有效的价格策略。

【英文版】

The unit price priority principle refers to the principle of giving priority to the unit price of goods in formulating prices. Typically, the lower the unit price of a product, the higher its sales volume will be. Therefore, when setting prices, the unit price of the product should be given priority consideration over other factors.

The advantages of the unit price priority principle are that it can make it easier for consumers to accept the price of goods, thereby promoting an increase in sales volume. In addition, if a company can increase sales volume by reducing the unit price of a product, then the company's sales revenue will also increase accordingly, which can help improve the company's competitiveness.

However, there are also some disadvantages to the unit price priority principle. Firstly, if a company blindly reduces the unit price of a product without considering other factors, then the company's profits may be affected. Secondly, if a company only reduces the unit price of a product to increase sales volume without considering market demand and competition environment, then the company's business strategy may be affected.

Therefore, when formulating prices, companies need to comprehensively consider multiple factors, including the unit price of goods, market demand, competition environment, etc. Only by comprehensively considering these factors can companies formulate more reasonable and effective pricing strategies.