Assesment of degree of monopolization of insurance sector in Serbia in the period 2011–2020

This article deals with the matter of determining the level of monopolization in the insurance sector of Central Serbia during the period 2011–2022. The basis of the research were data on the total insurance premium of insurance companies, for which we calculated the market concentration coefficient and the Hirschman-Herfindahl Index (HHI), as the most popular and most commonly used measures of concentration. Their values show a (relatively) high level of concentration, but without clear tendencies in its movement, and with minimal decline overall. Based on the equivalent number, as the reciprocal (inverse) value of the HHI coefficient, an index called the monopoly market ratio or boundary index of market monopolization was proposed, showing the degree to which the market is monopolized. The values of this index during the observed period range from around 75 to 60, with a clear downward tendency, significantly more intense than the minimal decline in the concentration coefficient values. This indicates that the insurance market in Serbia is reducing the influence of monopolistic (and oligopolistic) structures during the given period and is becoming increasingly competitive, despite the decrease in the number of insurance companies in the first half of the observed period and their unaltered number since 2018.