Promotion in my business is seasonal pricing. Because my business is related to tourism. The number of customers depending on the season. For example, in the high season of tourism, so there was a lot of customers. The company has a lot of profit. But in the low season, few tourists make the company a few customers and a lack of profit. But in the low season, few tourists make the company a few customers and a lack of profit. Require different pricing for different seasons.