Therefore, it is not difficult to understand the difference between Shenzhen and Zhuhai by first looking at the differences between Hong Kong and Macao and the changes in GDP and economic development.
A considerable part of Shenzhen's GDP lies in exports, in the 1990s. And thanks to Li Ka-shing. In other words, Shenzhen allows Li Ka-shing to invest in Shenzhen in order to develop its own exports. Li Ka-shing has three of the five major ports-Rotterdam, Hongkong and Yantian. With Yantian Port in Shenzhen in the Pearl River Delta, it will be much more difficult for Zhuhai Xiang to redevelop this port. As far as I know, Zhuhai officials don't seem to have a policy of direct investment, and they are looking for a way out in this respect.
Then it is inseparable from the development of the Pearl River Delta, which is purely a world factory under market operation, unlike the prosperity piled up by policies in the Yangtze River Delta. From the initial Pearl River Delta factory development to the later Pan-Pearl River Delta cooperation, until now the Pearl River Delta industry re-integration. It is impossible to develop only by relying on Shenzhen, which is inseparable from the development of the Pearl River Delta region and the Pan-Pearl River Delta. But during this time, as far as I know, Zhuhai has not found a corresponding way out. Once upon a time, it proposed an international airport, but it failed.
Secondly, regional development is inseparable from enterprises. There are Huawei, Fujitsu, Skyworth, Konka, ZTE, Vanke, China Merchants Bank, Guo Xin, Tencent and so on. But my understanding of Zhuhai is limited to Gree and Fahua.
Of course, why these enterprises are in Shenzhen and Zhuhai is still the problem of the people themselves. Shenzhen is the most inclusive city in China. It is neither exclusive nor flashy. On the other hand, it is a hot spot that only pays attention to efficiency and is not close to human feelings. And Zhuhai is destined to be a romantic city.
Then you can write a 3000-word paper for each project ... think about it and look up the information yourself.