11. The system of claim 10 , further comprising a message selector that uses a probabilistic use case model to choose, for each candidate recommendation, a selling message, thereby generating a recommendation, message pair for each candidate recommendation
12. The system of claim 11 , where the recommendation selector uses the probabilistic purchase decision model to choose a candidate recommendation based on the recommendation, message pair that maximizes boost in expected margin resulting from the candidate recommendation being issued, as compared to the candidate recommendation not being issued.