One of the remarkable aspects of tech companies is just how much revenue and value some are able to generate with so few employees.

Pessimists could view this as bad thing, that these companies don't require as many workers to generate massive revenue — and that our jobs will all be taken by robots. But it also shows how productive a more tech-focused economy could be per person.

But exactly how much money do companies like Apple or Google or Microsoft make per employee?

Expert Market looked at the top tech companies in the world, in terms of revenue, and showed us how much each makes per employee. Here are the top 12: