ISSN 0798 1015 HOME Revista ESPACIOS ! ÍNDICES / Index ! A LOS AUTORES / To the AUTORS ! Vol. 40 (Number 7) Year 2019. Page 19 Modeling of the cycle of reproduction process in the agrarian sector of economy (Ukraine) Modelación del ciclo del proceso de reproducción en el sector agrario de la economía (Ukrania) HUTOROV, Andrii O. 1; HUTOROVA, Olena O. 2; LUPENKO, Yurii O. 3; YERMOLENKO, Oleksii A. 4; VORONKO-NEVIDNYCHA, Tetiana V. 5 Received: 31/10/2018 • Approved: 12/02/2019 • Published 04/03/2019 Contents 1. Introduction 2. Methodology 3. Results 4. Discussion of results 5. Conclusions Bibliographic references ABSTRACT: The methodological basis was investigated and the use of periodogram analysis, Stokes’ integrals, Buys- Ballot scheme and autocorrelation functions for the analysis of cyclicity in reproduction processes was suggested. By analyzing the dynamics of the share of capital investments in gross value added for the period of 1956-2017, long-term, medium-term, short- term cycles and micro-cycles of reproductive processes in the national economy and the agrarian sector of the economy were revealed. Keywords: cyclicity, reproduction process, hidden periodicities, agrarian sector of economy. RESUMEN: Es investigada la base metodológica y el uso del análisis de periodogramas, Stokes integrales, esquemas de Buys-Ballot y las funciones autocorrelativas para el análisis del ciclo de los procesos de reproducción. Por medio del análisis de la dinámica de las inversiones capitales en el valor añadido bruto en 1956-2017. Son revelados a largo, mediano y corto plazo, los ciclos y los microciclos de los procesos de reproducción en la economía nacional y el sector agrario de la economía. Palabras clave: ciclicidad, proceso de reproducción, periodicidad oculta, sector agrario de la economía 1. Introduction The economic life of society is organically connected with the processes of reproduction of all elements of the economic system: economic relations, their subjects, productive forces and economic mechanism. In its turn, economic development is characterized by a periodic change in the process phases, which is based on the cyclicity of the reproductive process. Currently, the agrarian sector of the economy of Ukraine is a system-oriented segment of the national economy, where on average 13.4 % of gross value added was created in 2015- 2017. The food security of the State, employment in the rural areas and in the processing