The resources that they have are generally sold to wealthier countries. This is frequently done corruptly or corruption appears further down the line.
Much of the wealth generated by first world countries is layered, one layer of value adding on another. The process to say supply Starbucks with coffee beans will have multiple entities making a profit off each transaction. The coffee grower only gets to sell his beans once.
Australia, for example, their iron gets exported as ore, its processed, smelted, milled and then turned into products by another country. This annoys many Australians
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