Hmmm...homeless hotspots? Jon Stewart got all upset. Here is the video; check the comments.
MH over at Young, Hip, and Conservative makes the argument that in fact this is a euvoluntary exchange.
If he is wrong, then ANY transaction where you try to give a homeless person money in exchange for ANYTHING is not euvoluntary.
Interesting. Does being economically abject, in and of itself, render ALL exchanges involuntary?