The Demo-to-Product Gap? The March of nines?

In AI, the last 0.001% takes 99.999% of the time.

We need a name for it, and given how much the [Andrej & Dwarkesh](https://www.dwarkesh.com/p/andrej-karpathy) interview has been cited, it's only fair to call it **"The Karpathy Principle"**.

Here is a [30 second YouTube Clip](https://youtu.be/dLuBAA-eNL0) for reference.