Abstract:
We study lower limits for the ratio $\overline{F^{*\tau}}(x)/\,\overline F(x)$ of tail distributions, where $F^{*\tau}$ is a distribution of a sum of a random size $\tau$ of independent identically distributed random variables having a common distribution $F$, and a random variable $\tau$ does not depend on the summands.
Keywords:convolution tail, random sums of random variables, lower limit, heavy-tailed and light-tailed distributions.