Geographical knowledge: How to understand the market distance (economic distance) of a certain tourist attraction?

The market distance (economic distance) of a tourist attraction is the distance between a tourist attraction and an economically developed area. For example, the markets of some tourist attractions in eastern my country are close to each other, while the markets of some tourist attractions in western my country (especially Tibet) are far away. But for cross-border tourism, the market distance between tourist attractions in the east and west of my country must consider air transportation conditions. The tourist attraction market with the international airport nearby is closer.