This paper's key purpose is to research the Russian enterprises' innovation behaviour depending on the number of their employees. The behavioural
strategy was determined by the product life cycle dynamics (and the new product development time) in 2007-2018. The stable life cycle growth shown by
the innovative-active enterprises was believed to be an aftermath of their propensity to maintain the existing products via evolutionary development. In
contrast, the abrupt changes of the just-mentioned indicator were supposed to pave the way for broadening product diversity. In work, we managed to find
out that the innovative activity of large Russian enterprises was mainly aimed at rather sustaining the manufacturing of products already on the market
than widening their variety. Meanwhile, this growth driver of product diversity provided mostly by Small and Medium Enterprises (SMEs) had little impact on
innovative processes in the Russian economy as a whole. We suppose it to be in place due to the scope of the SMEs' innovative activity, which proved to be
many times less than that of large enterprises
Keywords: product life cycle, innovation development, groups of enterprises, innovation enterprise, product development time, innovation activities
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