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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}, theory}\href{https://en.wikipedia.org/wiki/Queueing_theory}{Wiki\_Queueing\_Theory},  pionereed by Agner Krarup Erlang (1878 – 1929)