An Incentive-Compatible Distributed Recommendation Model
| $D$ | set of documents, $d \in D$ |
| $A$ | set of agents, $i \in A$ |
| $L_i(d)$ | a proposition that is true if $i$ likes $d$ |
| $R_i(d)$ | a proposition that is true if $i$ has read $d$ |
| $P_r$ | the payoff for reading a liked document. |
| $C_r$ | the cost of reading a document. |
| $C_m$ | the cost of sending a message. |
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