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Below is a chart of the average wing price at each wing quantity — the first derivative of the previous graph.

Tulu and Bulu were no longer recognizably identical—but they shared the first derivative of identity.

For the mathematically inclined, it’s the first derivative of stimulus that is going to zero, not stimulus itself.

But that’s easily enough solved by looking at the first derivative: places that have growing GDP are notably happier than places with static or falling.

However, even a stable second derivative could attach to a positive first derivative, which itself represents the very essence of momentum.