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Out of the peak hour, the optimization software is able to reduce the number of groups to only two per minute on average, while service time is kept constant so as to save power.\\  b) Would it be useful for corporate B to keep in service the additional elevator also in this case?  \section{Discussion}  We discuss this problem in the context of the \textit{queueing theory}\href{https://en.wikipedia.org/wiki/Queueing_theory}{Wiki_que}, pionereed by Agner Krarup Erlang (1878 – 1929)