 Certain paradigmatic cases of exploitation clearly fit this analysis. Slavery is an exploitative relationship, and one that clearly harms slaves for the benefit of their masters. But as Alan Wertheimer has noted, some exploitation appears to be mutually advantageous rather than harmful (Wertheimer 1996: 14). Someone who charges a hiker lost in the desert $1,000 for a bottle of water takes unfair advantage of her. Nevertheless, the transaction is one from which both parties emerge better off relative to how they would have been, had the transaction not taken place. The seller has traded away something she values less (the bottle of water) for something she values more ($1,000). But so has the buyer. If the water is necessary to save her life, and if she values her life more than the $1,000 she gives up to save it, then she too is better off with the transaction than without it.