Discuss international trade before you begin. About half of the world's workforce works in agriculture. Many developing countries practice subsistence farming, where farmers produce just enough to feed themselves and their families. There isn't a lot left over for export. Farming in developed economies is more mechanized and much more productive.
Farmers raise crops to sell on the market.
This is called commercial farming. Many crops are raised for export. In the developing countries of Africa, Asia, and South America, crops such as coffee, tea, and cacao are grown for export. These crops are an important source of income for these countries. Many countries sell commodities instead of finished products.