Symbol p_esc

The passage around this formula

…it flags to a slower, more capable classifier that reviews the input and output together [ 1 ] . If $c_{\text{probe}}$ is the near-free cost of the first pass and $c_{\text{exchange}}$ the much larger cost of the second, and $p_{\text{esc}}$ is the fraction of traffic the probe escalates, the expected added cost per request is $\bar{c} = c_{\text{probe}} + p_{\text{esc}} \cdot c_{\text{exchange}}$. Because $p_{\text{esc}}$ is small on ordinary traffic, the average cost collapses toward $c_{\text{probe}}$ even though $c_{\text{exchange}}$ did not get any cheaper — which is the…

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