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Equation 16 · AI Inference Economics in Practice: An Advanced Technical Guide

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Pr/(u Qmax⁡)P_r / (u \, Q_{\max})

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This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text. Read the equation part by part below; each part has a contextual explanation and a link to its mathematical background.

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PrP_r

Symbol P_r

the reserved capacity’s price per hour.

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uu

Symbol u

u is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

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Qmax⁡Q_{\max}

Symbol Q_max

the maximum throughput it sustains per hour at full utilization.

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subscript

subscript

The lower label selects a particular version, component, or indexed member of the quantity. For example, x₀ and xₜ can be values at different positions.

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What the article says around this equation

The arithmetic is simple once both prices are in hand, and generalizes across any reserved-capacity product structured this way. Let PrP_r be the reserved capacity’s price per hour, Qmax⁡Q_{\max} the maximum throughput it sustains per hour at full utilization, and codc_{\mathrm{od}} the effective on-demand cost of the equivalent work. At actual utilization u , the effective cost per unit under reservation is PrP_r / (u \, Qmax⁡Q_{\max}) , and reservation wins exactly when

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