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| Symbol | Descriptions |
|
| The data type that publishers are interested in. |
| User |
| Probability of direct close connection of user with a publisher interested in data type |
| Probability of indirect close connection of user with a publisher interested in data type |
| Probability of close connection of user with a publisher interested in data type |
| A signed cheque from the publisher to pay the value of a data |
| An estimate of the value of a publisher’s signed cheque to user |
| A list of the user’s close connections with publishers |
| The value or amount of credit that the collector of a data type is willing to pay to the final deliverer. |
| Data |
| The metadata includes data type, sequence number, value, and maximum delivery of each data |
| Maximum delivery: the maximum number of publishers to receive the data. |
| Virtual data to determine the data value |
| The reward of virtual data to estimate the value of virtual data for the user |
| Close connection with the user: direct and indirect connections of a user with the data generator |
| The set of signed cheques by the publisher that each user carries with him. |
| The set of data each user carries. |
| Personal profit from data exchange: the benefit that a user can get from exchanging his data with another user. |
| Personal profit from cheque exchange: the benefit that a user can get from exchanging cheques from publishers with other users. |
| The payoff function of a user from the data exchange |
| Data exchange candidate list. In other words, the list of data that has the potential to be exchanged with another user. |
| Cheque exchange candidate list. In other words, the list of cheques from publishers that have the potential to be exchanged with another user. |
| The final list of data to exchange between two users |
| The final list of cheques of publishers to exchange between two users |
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