What do the chinese people the kingdom of ghana and caravans have in common

Chinese people, kingdom of Ghana and caravans were commonly involved in traveling great distances to exchange goods with people and other cultures.

Explanation:

In olden days, people used to exchange goods to get their required goods without using an exchange medium like money.

Chinese people, kingdom of Ghana and caravans travel a long distance to exchange the goods with people.

Kingdom of Ghana is known for its richness. They usually exchange gold for salt.  

A group of traders travel together to exchange the goods is known as Caravans. Caravans bring the goods from West Africa and exchange it and take some different goods back to West Africa.

1. seasonal

2. frictional unenployment

3. the number of the labor force multiplied by 100 and then subtract the number of unemployed.

4. 4%

5. an increase in prices