Actually, I don't know -- I haven't found that number just yet.

We had a board meeting Monday with not 1, not 2, but 3 MIT Professors in attendance; Glen Urban, Drazen Prelec, and Nelson Repenning. We were talking through the data from our most recent field study which, again, yielded an average offer acceptance rate of 66% and cost per action of about $5 (table below).