【中文版】

提高汇率会扩大需求的原因在于，当一个国家的货币升值时，外国人购买该国的产品和服务会更加便宜，从而刺激外国消费者对该国产品和服务的购买。同时，该国对外购买外国的产品和服务也会变得更加昂贵，从而抑制该国消费者的购买。但是，相对于外国消费者购买该国产品和服务所获得的利益，该国消费者购买外国产品和服务所受到的抑制作用较小，因此总体上会扩大需求。

具体来说，当一个国家的货币升值时，外国人购买该国的产品和服务会变得更加便宜。例如，如果韩国的货币升值，外国人去韩国旅游或购买韩国商品就会更加划算，因此会刺激外国消费者对韩国产品和服务的购买。同时，韩国人去外国旅游或购买外国商品就会变得更加昂贵，因此会抑制韩国消费者的购买。但是，相对于外国消费者购买韩国产品和服务所获得的利益，韩国消费者购买外国产品和服务所受到的抑制作用较小。因此，总体上会扩大需求。

此外，提高汇率还会影响人们的预期和信心。当一个国家的货币升值时，人们通常会认为该国的经济实力较强，未来发展前景较好，从而增加对该国产品和服务的需求。这种信心和预期也会促进该国经济的发展和需求的扩大。

【英文版】

The reason why an increase in exchange rate will expand demand is that when a country's currency appreciates, foreigners can purchase the country's products and services more cheaply, which stimulates foreign consumers to buy more of the country's products and services. Meanwhile, the country's consumers find it more expensive to purchase foreign products and services, which suppresses their purchases. However, the benefits gained from foreign consumers purchasing the country's products and services are greater than the restrictions imposed on domestic consumers purchasing foreign products and services. Therefore, overall, the demand will expand.

Specifically, when a country's currency appreciates, foreigners can purchase the country's products and services more cheaply. For example, if South Korean currency appreciates, foreigners can travel to South Korea or purchase South Korean goods more cheaply, which stimulates foreign consumers to buy more South Korean products and services. At the same time, South Koreans find it more expensive to travel to or purchase foreign goods, which suppresses their purchases. However, the benefits gained from foreign consumers purchasing South Korean products and services are greater than the restrictions imposed on South Korean consumers purchasing foreign products and services. Therefore, overall, the demand will expand.

In addition, an increase in exchange rate will also affect people's expectations and confidence. When a country's currency appreciates, people usually think that the country's economic strength is stronger and its future development prospects are better, which increases the demand for the country's products and services. This confidence and expectation will also promote the development of the country's economy and the expansion of demand.