Trade.

Primary Industry[edit | edit source]

This is the main production of LEDCs, with their exports of primary products.

Primary products include: wood, agriculture, minerals, and fish.

This requires minimal processing.

Secondary Industry[edit | edit source]

This is the processed of manufactured goods that were first primary products.

Tertiary Industries[edit | edit source]

These are services such as: schools, hospitals, media, armed forces etc.

Quaternary Industries[edit | edit source]

This is research and development.

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