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The limit of a renewal reward process with heavy-tailed rewards is not a linear fractional stable motion. (English) Zbl 0963.60032
There are considered a renewal reward process with both inter-renewal times and rewards that have heavy tails of exponents $$\alpha$$ and $$\beta$$, respectively, where $$1< \alpha< 2$$, $$0<\beta<2$$. It was proved by J. B. Levy and M. S. Taqqu [ibid. 6, No. 1, 23-44 (2000; Zbl 0954.60071)] that the suitably normalized renewal reward process converges to Lévy stable motion with index $$\beta$$, possesses stationary increments and is self-similar in the case $$\beta>\alpha$$. The limit process was identified through its finite-dimensional characteristic functions. The authors provide an integral representation for the process and show that it does not belong to the family of linear fractional stable motions.

##### MSC:
 60G18 Self-similar stochastic processes 60K05 Renewal theory
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