The opponent is compelled to move the more valuable piece to avoid its capture, thereby exposing the less valuable piece which can then be captured (see chess piece relative value).
The infection is becoming increasingly important as globalization allows it to spread to more and more locations, and as more travelers encounter the parasites.
Produce and other basic staples are still offered, but other items are far more likely to be manufactured items such as electronics, name brand clothing and other wares.
