These are not images of "problems." They're images of people. There are 27 million slaves in the world today: That's more than double the number of people taken from Africa during the entire transatlantic slave trade. A hundred and fifty years ago, an average agricultural slave cost over three times the average yearly wage of an American worker, about US$50,000 in today's money. Yet now, entire families can be enslaved for generations over a debt as small as $18. Slavery is illegal everywhere, but it exists all over the world.