⁸A lot of physical energy would also be wasted if the monkey is already half-way up the tree and then decides to go for the other banana. But arguably that waste of energy would be taken into account by the monkey in its planning, so it does not need to be evoked as a separate reason for commitment. I think we can take here a viewpoint considering purely computational resources: Even if the monkey is intelligent enough to eventually understand this waste of physical energy after some thinking, it would still spend a lot of time and computational resources to reach that conclusion if there were no commitment mechanisms.