Living in the world overwhelming by globalization today, not any country can stand out from the global village and survive firmly by itself. Humanity is to live on cooperation and exchanging, not ending up singly. Even our ancestors had already realized to live in villages, hunt in groups, and shared with tribes. These still happen in human society today that there exists a web of trade and each country on earth is attached to it.
Bound to its limited geographical conditions, every country has or has not some natural sources. Climates and biological diversity are also very different from place to place. People will lead more sufficient lives if they exchange resources and products with those from other regions. The calling is still going on connecting different groups of people and, as a result, forming the world wide economic system for example the international trading market. A man living in Asia can buy his girl a fresh bunch of flowers just sent from Holland last night, or a Taiwanese student may go advanced study in the USA and buy a notebook labeled MIT (made in Taiwan). .
Also, in this connection, the well-being of a country is certainly related to others'. People live in the condition composed of needs in many aspects economic, cultural aspects. Well-being of other countries influenced us in different ways. When the war burst out around the Middle East in 70's, deficiency in oil supplying had seriously stricken the world. Inflation and price fluctuation then started to restrain the wealth of western countries, no matter how plausibly irrelevant these two worlds are. The matter is that what is happening in one place will truly act on others in both perceptible and unrecognized ways.
To conclude, the material progresses and well-being of a country certainly connect to others not only in the past, but this phenomenon is an inherent nature in human society. With the impacting growth of technology, it is ensured that this commonness will still exist that despite of the physical distance, lives in different countries connect to others closely and extensively.