Yes. There's the greed and the sad fact that some people are prepared to do anything for profit. On the other side, there are dreams. Desperate people who want to improve their situation in life are prepared to do anything. Unfortunately, they fall prey and victim to the first category.
Regarding general prevention, obviously anything we can do to assist people--particularly in developing countries where they are most vulnerable--to get access to legitimate opportunities to pursue their dreams in their own country is helpful. So helping development is a major thing.
There's another type of prevention that is a little more targeted, which can also be done with countries where we know we have a lot of trafficking. It's to work with them on explaining to people who have those dreams what the risks are, and to help them understand how they're going to be victimized—help them make sure they do not become the victims of traffickers. But that is very difficult, because if you go to Manila in the Philippines, let's say, you will see long lines of young women and men waiting at an employment agency. Some of those employment agencies are legitimate and some are not. Some will deliver those individuals into the hands of traffickers and others are legitimate agencies. For potential victims, there's no way of knowing.
Again, it's back to international cooperation and working with that country, making sure they regulate, that they do something about overseas employment agencies, and that you work together with them. I'm afraid there is no easy solution to preventing the exploitation of people who live in difficult circumstances in their own country.