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DTM.4:3 - Forces
| Force | Tension |
|---|
| A decision needs a useful prediction | The available model may establish only a conditional possibility. |
| A rare-variant test is inexpensive | Reinforcement or several interacting variants can require a finite introduction. |
| Local stability summarizes nearby behavior | Large changes and delayed feedback can cross its boundary. |
| A response changes current prevalence | It may also change the environment in which another variant can establish. |