When Michael Parker sits down to his private Spanish tutoring sessions, he pays his teacher $8 per hour, which is much less than the $25 per hour he was previously paying to his teacher in Iowa. But his new teacher, Yesenia Mateu Grave, takes away double the fee that she normally gets. That’s because Mateu Grave lives in Guatemala, where wages are a fraction of those paid in Iowa.

Thanks to Web conferencing, Mateu Grave teaches students around the world via a site called Speak Shop,...

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