Well, there's the scenario where one person does both the engineering and the drinks, but only has a limited amount of effort in his job to exert, and he chooses to devote all of that effort to engineering the plane and only a tiny portion of it to ensuring the quality of the drinks. That scenario is obviously absurd.

But if you slightly modify that, person->company and effort->money, that's pretty much what's going on. The company has a limited amount of money to spend, and spending most of it on engineering and almost nothing on drinks has similar dynamics to a single worker who's choosing to spend all his time on engineering and almost nothing on drinks. Even if the company internally contains several workers and the engineer and the drink maintainer are different people.