Symbol rho_t

The passage around this formula

…whatever genuinely new content was added, minus whatever was lost to forgetting or to a shrinking population of transmitters: $C_{t+1} = \rho_t C_t + I_t - L_t$. Here $C_t$ is the stock of cultural complexity in circulation at time t ; $\rho_t$ $\in$ [0,1] is the transmission-fidelity coefficient — the share of $C_t$ that survives one round of copying, the same quantity Henrich’s Tasmania case shows collapsing when the effective transmitting population shrinks; $I_t$ is genuinely new human innovation entering the pool; and $L_t$ is loss…

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