Introduction. Since competition influences all the spheres of economic life, its research is scattered among different fields of economic science and different research areas. The purpose of the article is to systematize existing approaches to competition assessment, based on single multidimensional methodological approach, to make economic competition research at the micro-, meso-and macrolevels better managed and presented, as well as to develop comprehensive system of indicators to assess the state of economic competition. Results. Having used the Porter's diamond model, the authors divided three dimensions of competition research: horizontal (within the relevant market or stack of related markets), vertical (within the process chain), and potential competition dimension (within all the markets in the economy due to the capital flow between them that provides competitive pressure on the participants of the relevant market). The sets of indicators of the relevant type of competition are identified within every research dimension. Combined use of these indicators allows us to determine current state of competition in the market, and to verify the results obtained. The aggregated system of competition indicators is introduced to ensure comprehensive and more profound analytical support for managerial decisions.

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Competition law, economics and policy are facing a regulatory metamorphosis due to the rise of the digital economy. US, China and EU jurisdictions have announced and partially introduced systemic changes to their competition law frameworks to keep pace with technological developments. The Antimonopoly Committee of Ukraine is following the principle of ‘three monkeys’, it sees no on-line platforms, hears no on-line platforms, speaks of no on-line platforms, so nothing has been undertaken or even announced. The paper is twofold. Firstly, it analyses the economic background and features of the digital economy and shows why the available instruments of competition enforcement are ineffective. The second part of the paper shows why the current Ukrainian competition law framework is (in)capable of dealing with challenges posed by on-line giants. Regarding the need for a recalibration of regulatory approaches in digital markets, Ukraine faces the dilemma of a proper combination of ex ante and ex post measures.

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