HOW DO WE EXCHANGE?

Trade, transport and finance.

Do the following activities:

What is service sector or tertiary sector? What activities are included?
What activities are included in the quaternary sector?
What is barter?
What are concrete markets?
What are abstract markets?
What is internal trade?
What does the wholesale trade consist of ? and the retail trade?
What is import? and export?
When do we say that a country have a balance of payments surplus?
Which are the main types of land transport?
What is water transport?
What is the main advantage of the sea transport? What is its main disadvantage?
What is the main advantage of the air transport? What are its main disadvantages?
What is intermodal transportation?