14. The system of claim 13 wherein the code further executes by the processor of the computer system to configure the computer system into the machine for performing: selecting 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.
14. The system of claim 13 wherein the code further executes by the processor of the computer system to configure the computer system into the machine for performing: selecting 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. 15. The system of claim 14 wherein the code further executes by the processor of the computer system to configure the computer system into the machine for using 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.