When one bottleneck is eliminated, another bottleneck arises.

https://gyazo.com/4c340c60a935391302f3b9910d66c3a2

When the flow rate cannot be obtained because of a certain bottleneck B is too thin, making B thicker will increase the flow rate up to a certain point.

At some point, however, making B thicker becomes ineffective.

B is no longer the bottleneck, because other parts of the system have become bottlenecks.

Overextended B gets to play.

The process of making the bottleneck thicker will always lead to a situation where it makes no sense to make it any thicker.

If we repeat the same actions as in the past by following past successes and precedents without considering the implications of past actions, the costs incurred will be wasted.

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