For the less busy person, slack absorbs the error, thus minimizing the consequences. The busy person, on the other hand, cannot shrug it off so easily. Each added hour must come at the expense of something else. The same mistake has bigger consequences. We just saw how slack can be inefficient. We buy items destined to become cabinet castaways, and we use time and money inefficiently. Here we see that slack provides a hidden efficiency. It gives us room to maneuver, to reshuffle when we err. Slack gives us room to fail.
