Behavioral economy is one useful and fun social subject. Behavioral economists ususally research how and why human behaviors may influence economy growth or recession, or how and why economy environment changing factor may influence human behavior changes.

In any countries, whether attractive airport appearance design, airport convenient public transportaton tools service, e.g. enough airport bus, taxi, train, tram, underground train, ferry etc. number supplying, which can let any foreign travellers find and choose any kinds of public transportaton tools to catch to arrive destinations when they arrive any countries' airports easily, different kinds of varoety of attractive product shops or food courts/shops which can let airport passengers to sit down and choose any kinds of food to eat or they can choose any books, magazines, or stationerys or cigarettes, wine, toys, electronic products, e.g. desktop, laptop computers etc. products to consume for reading or using need in the airport's any restaurants or ships conveniently.