2. Cost-effectiveness of consumer spending;

3. The relationship between purchase price and profit;

4. The relationship between sales price and total sales;

5. The impact of preferential commodity activities on sales;

6. The relationship between commodity unit price and total price;

7. Price comparison of similar commodities;

8. The price difference caused by different packaging of the same commodity;

9. Competition and price and sales differences of similar goods of various brands;

10. Calculation of total income of supermarkets, etc.