We obtain the strong growth rate for the sum Sn of random variables by using a Hájek-Rényi type maximal inequality. Under the same conditions as that in Fazekas and Klesov [2000. A general approach to the strong law of large numbers. Theory Probab. Appl. 45, 436-449], we get sharper results...

Spare parts generate high sales margins and improve customer loyalty by extending the useful life of base products. Forecasting and managing the spare-parts business is challenging, however, due in no small measure to short life cycles and long support life for the base products. At...