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Again, I think your half correct. The "car shop" model only works if you actually work. Working does not involve teaching other employees how to do their job. That is what job training is for. If you do not know how to do the job, then you shouldn't take it on and should leave it for someone else. You can "shadow" your coworker when they are doing the job, but you will not be paid to do it. That is the "car shop" model and it has worked for decades. You can't pay your head mechanic twice what the lowest...

Your comment about speed is only half correct. Yes, you can change your flat in under 5 min. But you are not racing in a shop. You are working. Working means taking no risks, and having the highest of quality. If I saw a mechanic fix my flat in less than 10 minutes I would never go back. There are a ton of things to check, first and foremost the cause. This one thing alone can take over 10 minutes. The worst buisness model involves the risk of having an unsatisfied customer who will not return. If I found that...