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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">guuvest</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник университета</journal-title><trans-title-group xml:lang="en"><trans-title>Vestnik Universiteta</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1816-4277</issn><issn pub-type="epub">2686-8415</issn><publisher><publisher-name>State University of Management</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26425/1816-4277-2023-3-80-89</article-id><article-id custom-type="elpub" pub-id-type="custom">guuvest-4392</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ЭКОНОМИКА: ПРОБЛЕМЫ, РЕШЕНИЯ И ПЕРСПЕКТИВЫ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ECONOMICS: PROBLEMS, SOLUTIONS AND PROSPECTS</subject></subj-group></article-categories><title-group><article-title>Закон единой цены в пределах одной страны: на примере Бенина</article-title><trans-title-group xml:lang="en"><trans-title>The law of the single price within one country: the example of Benin</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4203-1556</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Вику</surname><given-names>К.Н.К.</given-names></name><name name-style="western" xml:lang="en"><surname>Vikou</surname><given-names>N.C.C.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Вику Коджови Нельсон Крепин – аспирант.</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Codjovi N.C. Vikou - Postgraduate Student.</p><p>Saint-Petersburg</p></bio><email xlink:type="simple">vikounelson@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Санкт-Петербургский государственный экономический университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Saint-Petersburg State University of Economics</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>17</day><month>05</month><year>2023</year></pub-date><volume>0</volume><issue>3</issue><fpage>80</fpage><lpage>89</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Вику К., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Вику К.</copyright-holder><copyright-holder xml:lang="en">Vikou N.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://vestnik.guu.ru/jour/article/view/4392">https://vestnik.guu.ru/jour/article/view/4392</self-uri><abstract><p>В статье рассматривается тестирование гипотезы о законе единой цены в пределах одной страны на примере регионов Бенина. Проверка гипотезы проведена эмпирическим путем и основана на тестах единичного корня для панельных данных потребительских цен на внутригосударственном уровне Бенина. Особое внимание уделено обзору наиболее актуальных тестов единичного корня, применяемых для анализа панельных данных. В исследовании отмечено как шок, влияющий на цены в одном регионе, может повлиять на цены и в других регионах страны, что объясняется возникающей перекрестной зависимостью. В анализе использованы временные ряды потребительских цен по регионам Бенина. В итоге была предложена методика, которая учитывает возможности исследования перекрестной зависимости данных и определяет условия выбора теста на единичный корень для проверки выполнения закона единой цены. В результате проведенного анализа стационарности панельных данных установлено, что закон единой цены соблюдается не для всех товаров первой необходимости по регионам Бенина, а также получена оценка дифференциации регионов страны по уровню потребительских цен.</p></abstract><trans-abstract xml:lang="en"><p>This article aims to test the hypothesis of the law of the single price within one country on the example of the regions of Benin. The checking of the hypothesis was carried out empirically and is based on unit root tests for panel data on consumer prices at the national level of Benin. Special attention is paid to the review of the most relevant unit root tests used for the analysis of the Panel data. The study noted how a shock affecting prices in one region could also affect prices in other regions of the country, due to cross-dependence. The time series of consumer prices by regions of Benin were used. A technique has been proposed that takes into account the possibilities of studying the cross-dependence of the data and defines the conditions for selecting the unit root test to verify the implementation of the law of the single price. As a result of the analysis of the stationarity of panel data, it was found that the law of a single price is not observed for all essential goods in the regions of Benin and an assessment of the differentiation of the country’s regions by the level of consumer prices was obtained.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>стационарность</kwd><kwd>единичные корни</kwd><kwd>панельные данные</kwd><kwd>тест на стационарность</kwd><kwd>тестирование перекрестной зависимости</kwd><kwd>закон единой цены</kwd><kwd>потребительские цены</kwd><kwd>регион</kwd><kwd>Бенин</kwd><kwd>автокорреляция</kwd></kwd-group><kwd-group xml:lang="en"><kwd>stationarity</kwd><kwd>unit roots</kwd><kwd>panel data</kwd><kwd>stationarity test</kwd><kwd>cross-dependence testing</kwd><kwd>single price law</kwd><kwd>consumer prices</kwd><kwd>region</kwd><kwd>Benin</kwd><kwd>autocorrelation</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Chortareas G., Kapetanios G. 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