Usually developed countries export valuable manufactured goods such as electronics and cars and import cheaper primary products such as tea and coffee. In developing countries the opposite is true.
The diagram below shows the percentage of exports in developing and developed countries.
The result of the pattern of world trade is that the producers of primary products in developing countries lose out with low wages and poor standards of living.
With little money they cannot afford things such as primary education for their children. Many children are required to work to help the family earn a living.