The article considers the current problem of improving product range online store in COVID-19 conditions. There is a steady tendency to increase share e-commerce global volume retail trade, level visits stores. It was found that system management includes such organizational activities as planning (market analysis, formation, sales and logistics); organization (organization order processing, an...

While abundant empirical studies support the long-range dependence (LRD) of mortality rates, corresponding impact on securities is largely unknown due to lack appropriate tractable models for valuation and risk management purposes. We propose a novel class Volterra that incorporate LRD into actuarial valuation, retain tractability, are consistent with existing continuous-time affine models. der...