During the Spring Festival promotion, I found that many gold jewelry discount promotions were found. Many of them were found in Shenzhen. Shenzhen is cheap and Hong Kong is cheap?

By huanggs
Why is Shenzhen's gold brand cheaper than gold jewelry brands in other regions? The key is that there are more discount brands than brands in other regions in China. A lot of brand areas are in Shenzhen. Should it be gold and cheap?