\input zb-basic \input zb-ioport \iteman{io-port 06053723} \itemau{O\u{g}uz, Barlas; Anantharam, Venkat} \itemti{Hurst index of functions of long-range-dependent Markov chains.} \itemso{J. Appl. Probab. 49, No. 2, 451-471 (2012).} \itemab Summary: A positive recurrent, aperiodic Markov chain is said to be long-range dependent (LRD) when the indicator function of a particular state is LRD. This happens if and only if the return time distribution for that state has infinite variance. We investigate the question of whether other instantaneous functions of the Markov chain also inherit this property. We provide conditions under which the function has the same degree of long-range dependence as the chain itself. We illustrate our results through three examples in diverse fields: queueing networks, source compression, and finance. \itemrv{~} \itemcc{} \itemut{Markov chain; long-range dependence; Hurst index} \itemli{doi:10.1239/jap/1339878798 euclid:jap/1339878798} \end