What makes Huaqiang North rapid development？

Huaqiang North, China’s No. 1 Electronics Street, is the world’s largest distribution center for electronic products and accessories. At its peak, the average daily flow of people was 500,000. However, it only took 21 years to develop from a barren land into Asia's largest electronics market, and it only has a history of 45 years so far. So what makes Huaqiang North develop so rapidly?

[@joseph1150]

China is facing a lot of economic headwinds, between debt and international relations decaying. I fear that these booming cities will be China's Rust belt.