Analyze the location conditions for Shanghai to become the largest commercial center in China.

According to high school geography, it should be analyzed like this:

1. is located in the eastern central part of China, at the eastern end of the Yangtze River Basin. The service area is vast.

2. Roads, railways, inland rivers, shipping and aviation extend in all directions, and the three-dimensional transportation by land, sea and air is convenient.

3. Large population, dense surrounding urban agglomerations and broad consumer market.

4. Policy advantages.