1. Low cost: The cost of semi-fat and semi-lean mutton used for mutton slices of Uncle Shepherd is lower than that of pure lean mutton, so the price is relatively cheap.

2. Simple production: The production process of Uncle Shepherd's mutton slices is simple, just tie the mutton tightly and then freeze the slices, so the cost is lower.

3. Direct selling mode: Uncle Shepherd's mutton slices adopt direct selling mode, which saves the middleman link and enables the products to be directly sold to consumers at a lower price.

4. Small profits but quick turnover: Due to the low price of mutton slices of Uncle Shepherd, the company will realize profit by increasing sales, which can also be understood as the business strategy of small profits but quick turnover.

5. Brand effect: As a well-known brand of mutton slices, Uncle Shepherd's brand effect can attract more consumers to buy his products, thus reducing the sales cost of products and making the prices of products more competitive.

6. Short shelf life: Uncle Shepherd's mutton slices have a short shelf life and can only be kept for about two days, so it is necessary to speed up the sales, which is one of the reasons for the relatively low price.

Generally speaking, the reason why Uncle Shepherd's mutton slices are cheap is because the company has taken a series of measures to reduce costs and improve efficiency in production, sales and management, so as to achieve lower prices for consumers.