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| Symbols | Description |
|---|---|
 |
The cost of arranging a commitment deal |
| δ | The compensation cost |
| c | The cost of cooperation in the PD game |
| b | The benefit of cooperation in the PD game |
| x | The degree of confidence in a correct intention prediction |
| θ | The confidence threshold to rely on intention recognition (i.e. if x > θ) |
| r | The accuracy-to-confidence ratio |
| y | The accuracy of intention prediction, given the confidence (y = r × x) |
| β | The intensity of selection |
