There are several reasons why things on Douyin are cheaper than in physical stores:

1. Low operating costs: Douyin merchants do not need to pay rent, labor and other expenses like physical stores when selling on Douyin, so they can lower prices to attract more consumers.

2. Bulk procurement: Douyin merchants usually cooperate directly with manufacturers or large suppliers to obtain goods in bulk, which can get lower purchase prices and thus reduce sales prices.

3. Competitive pressure: The competition between Douyin merchants is fierce. In order to win more consumers, they will improve their competitiveness by lowering prices.

4. Platform strategy: As an e-commerce platform, Douyin usually adopts some promotional and marketing strategies, such as limited-time specials and discounts, which can attract more consumers and also enable merchants to sell goods at lower prices.

5. Brand effect: Some well-known brands have high visibility and number of fans on Douyin. In order to attract consumers and increase sales, they may lower the price of goods on Douyin.

In general, the prices of goods on Douyin are relatively low, mainly due to the combined effects of factors such as low operating costs, bulk purchases, competitive pressure, platform strategy and brand effect of Douyin merchants.