Botswana's school-leavers are, on average, more literate and numerate than South Africa's, so workers are not hard to train.

ECONOMIST: The desert booms

It was once assumed, for instance, that a liberal arts degree holder was numerate and literate and knew how to draw lessons from history, weigh evidence, think, write, speak, debate and learn.

FORBES: Is College Worth It?

They will require workers that are literate, numerate, adaptable, and trainable in a word, educated.

ECONOMIST: Education and the wealth of nations