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\item Follows our premise (is Z-shaped)   \item Can be easily adjusted based on user feedback (by adjusting $e$)  \item Takes the size of the city into consideration  \end{itemize}     More bell-curved or sigmoid functions:   \begin{itemize}   \item https://en.wikipedia.org/wiki/Gaussian_function   \item https://en.wikipedia.org/wiki/Sigmoid_function   \item https://en.wikipedia.org/wiki/Generalized_logistic_curve   \item https://en.wikipedia.org/wiki/Gompertz_curve  \end{itemize}