Avaliação da validade do Global Entrepreneurship Index

Autores

DOI:

10.14211/ibjesb.e2050

Palavras-chave:

Sistema Nacional de Empreendedorismo. Ecossistema de Empreendedorismo. Índice composto

Resumo

Objetivo: avaliar se o Global Entrepreneurship Index (GEI) é uma metodologia válida para mensurar os sistemas nacionais de empreendedorismo. Método: modelagem de equações estruturais, com a utilização do software SmartPLS 3.0, a fim de mensurar o modelo formativo do GEI, e verificar a validade convergente dos construtos, a colinearidade dos indicadores e sua relevância para o empreendedorismo. Originalidade/Relevância: ainda que o GEI se baseie nas recomendações da OCDE para a construção de indicadores compostos (índices), nenhum estudo (nem mesmo elaborado pelos desenvolvedores do GEI) foi encontrado sobre a validade do índice como metodologia de mensuração do empreendedorismo. Resultados: os subíndices e os indicadores analisados se mostraram adequados para mensurar o empreendedorismo, embora haja a necessidade de substituir os componentes de nível micro dos indicadores “opportunity perception” e “networking”, tendo em vista os resultados distorcidos apresentados do que se entende como empreendedorismo produtivo. Contribuições teóricas/metodológicas: as principais contribuições deste estudo estão direcionadas aos desenvolvedores de indicadores, pois é sugerido o uso de componentes capazes de capturar aspectos associados ao empreendedorismo de alto impacto e de base tecnológica, em vez da criação de um novo negócio. Isso se dá porque componentes genéricos fornecem resultados míopes sobre o estado do empreendedorismo, prejudicando, assim, estudos comparativos em nível de país.

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Biografia do Autor

Eduardo Avancci Dionisio, Departamento de Política Científica e Tecnológica (DPCT), Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brasil

é professor na área de administração no Instituto Federal de Ciência e Tecnologia de São Paulo (IFSP). Possui mestrado pela UNICAMP e Graduação pela FATEC. Suas áreas de interesse incluem empreendedorismo produtivo, ecossistemas empreendedores e inovação. Seus artigos vem sendo publicados em revistas como Technology Forecasting and Social Change e Journal of Intelectual Capital.

Dirceu Silva, Faculdade de Educação (FE), Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brasil

é professor na Faculdade de Educação da Universidade Estadual de Campinas (UNICAMP). Possui doutorado, mestrado e graduação, todas pela USP. Suas áreas de interesse incluem Administração, Produção, Empreendedorismo, Saúde e Educação. Seus artigos vem sendo publicados em revistas como Process Safety and Environmental Protection e Asia-Pacific Journal Of Business Administration.

Ruy Quadros Carvalho, Departamento de Política Científica e Tecnológica (DPCT), Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brasil

é professor no departamento de política científica e tecnologica da Universidade Estadual de Campinas (UNICAMP). Possui doutorado pela University of Sussex, mestrado pela UNICAMP e graduação pela EAESP/FGV. Suas áreas de interesse incluem inovação, gestão da inovação tecnológica, avaliação de projetos de P&D. Seus artigos vem sendo publicados em revistas como Latin American Business Review e Research Policy.

Edmundo Inácio Júnior, Faculdade de Ciências Aplicadas (FCA), Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brasil

é professor na faculdade de ciências aplicadas da Universidade Estadual de Campinas (UNICAMP). Possui doutorado pela UNICAMP, mestrado pela UFPR e graduação pela UEM. Suas áreas de interesse incluem inovação, empreendedorismo e ecossistemas empreendedores. Seus artigos vem sendo publicados em Technology Forecasting and Social Change e International Journal on Management of Innovation & Technology.

Referências

Ács, Z. J., Åstebro, T., Audretsch, D., & Robinson, D. T. (2016). Public policy to promote entrepreneurship: a call to arms. Small Business Economics, 47(1), 35-51. https://doi.org/10.1007/s11187-016-9712-2

Ács, Z. J., Autio, E., & Szerb, L. (2014). National Systems of Entrepreneurship: Measurement issues and policy implications. Research Policy, 43(3), 476-494. https://doi.org/10.1016/j.respol.2013.08.016

Ács, Z. J., & Correa, P. (2014). Identifying the Obstacles to High-Impact Entrepreneurship in Latin America and the Caribbean. GMU School of Public Policy Research Paper, (5), 1-48. https://doi.org/10.2139/ssrn.2534412

Ács, Z. J., Estrin, S., Mickiewicz, T., & Szerb, L. (2018a). Entrepreneurship, institutional economics, and economic growth: an ecosystem perspective. Small Business Economics, 51(2), 501-514. https://doi.org/10.1007/s11187-018-0013-9

Ács, Z. J., & Szerb, L. (2009). The Global Entrepreneurship Index (GEINDEX). Foundations and Trends® in Entrepreneurship, 5(5), 341-435. https://doi.org/10.1561/0300000027

Ács, Z. J., Szerb, L., Autio, E., & Lloyd, A. (2018b). The Global Entrepreneurship Index 2018. The Global Entrepreneurship and Development Institute. New York: Springer International Publishing. https://doi.org/10.1007/978-3-030-03279-1

Ali, A., Kelley, D. J., & Levie, J. (2020). Market-driven entrepreneurship and institutions. Journal of Business Research, 113, 117-128. https://doi.org/10.1016/j.jbusres.2019.03.010

Amorós, J. E., Cristi, O., & Naudé, W. (2021). Entrepreneurship and subjective well-being: Does the motivation to start-up a firm matter? Journal of Business Research, 127, 389-398. https://doi.org/10.1016/j.jbusres.2020.11.044

Asante, E. A., & Affum-Osei, E. (2019). Entrepreneurship as a career choice: The impact of locus of control on aspiring entrepreneurs’ opportunity recognition. Journal of Business Research, 98, 227-235. https://doi.org/10.1016/j.jbusres.2019.02.006

Atiase, V. Y., Mahmood, S., Wang, Y., & Botchie, D. (2018). Developing entrepreneurship in Africa: investigating critical resource challenges. Journal of Small Business and Enterprise Development, 25(4), 644-666. https://doi.org/10.1108/JSBED-03-2017-0084

Audretsch, D. B., & Belitski, M. (2017). Entrepreneurial ecosystems in cities: establishing the framework conditions. The Journal of Technology Transfer, 42(5), 1030-1051. https://doi.org/10.1007/s10961-016-9473-8

Autio, E., & Fu, K. (2014). Economic and political institutions and entry into formal and informal entrepreneurship. Asia Pacific Journal of Management, 32(1), 67-94. https://doi.org/10.1007/s10490-014-9381-0

Autio, E., & Rannikko, H. (2016). Retaining winners: Can policy boost high-growth entrepreneurship? Research Policy, 45(1), 42-55. https://doi.org/10.1016/j.respol.2015.06.002

Belitski, M., & Desai, S. (2016). Creativity, entrepreneurship and economic development: city-level evidence on creativity spillover of entrepreneurship. Journal of Technology Transfer, 41(6), 1354-1376. https://doi.org/10.1007/s10961-015-9446-3

Beynon, M. J., Jones, P., & Pickernell, D. (2020). Country-level entrepreneurial attitudes and activity through the years: A panel data analysis using fsQCA. Journal of Business Research, 115, 443-455. https://doi.org/10.1016/j.jbusres.2019.11.021

Bido, D. de S., & Da Silva, D. (2019). SmartPLS 3: especificação, estimação, avaliação e relato. Administração: Ensino e Pesquisa, 20(2), 488-536. https://doi.org/10.13058/raep.2019.v20n2.1545

Bogatyreva, K., Edelman, L. F., Manolova, T. S., Osiyevskyy, O., & Shirokova, G. (2019). When do entrepreneurial intentions lead to actions? The role of national culture. Journal of Business Research, 96, 309-321. https://doi.org/10.1016/j.jbusres.2018.11.034

Bogetoft, P. (2012). Performance Benchmarking. New York: Springer. https://doi.org/10.1007/978-1-4614-6043-5

Bosma, N., Hill, S., Ionescu-Somers, A., Kelley, D., Levie, J., & Tarnawa, A. (2020). Global Entrepreneurship Monitor: 2019/2020 Global Report. London: Global Entrepreneurship Research Association and London Business School. Retrived from https://www.babson.edu/media/babson/assets/global-entrepreneurship-monitor/2019-2020-GEM-Global-Report.pdf

Bosma, N., & Sternberg, R. (2014). Entrepreneurship as an urban event? Empirical evidence from European cities. Regional Studies, 48(6), 1016-1033. https://doi.org/10.1080/00343404.2014.904041

Bruns, K., Bosma, N., Sanders, M., & Schramm, M. (2017). Searching for the existence of entrepreneurial ecosystems: a regional cross-section growth regression approach. Small Business Economics, 49(1), 31-54. https://doi.org/10.1007/s11187-017-9866-6

Buenstorf, G., & Costa, C. (2018). Drivers of spin-off performance in industry clusters: Embodied knowledge or embedded firms? Research Policy, 47(3), 663-673. https://doi.org/10.1016/j.respol.2018.01.015

Cervelló-Royo, R., Moya-Clemente, I., Perelló-Marín, M. R., & Ribes-Giner, G. (2020). Sustainable development, economic and financial factors, that influence the opportunity-driven entrepreneurship. An fsQCA approach. Journal of Business Research, 115, 393-402. https://doi.org/10.1016/j.jbusres.2019.10.031

Chang, Y.-Y., & Chen, M.-H. (2020). Creative entrepreneurs’ creativity, opportunity recognition, and career success: Is resource availability a double-edged sword? European Management Journal, 38(5), 750-762. https://doi.org/10.1016/j.emj.2020.03.004

Cieślik, J., Kaciak, E., & Van Stel, A. (2018). Country-level determinants and consequences of overconfidence in the ambitious entrepreneurship segment. International Small Business Journal: Researching Entrepreneurship, 36(5), 473-499. https://doi.org/10.1177/0266242617748201

De Bernardi, P., & Azucar, D. (2020). Innovation and Entrepreneurial Ecosystems: Structure, Boundaries, and Dynamics. In Innovation in Food Ecosystems: Entrepreneurship for a Sustainable Future (pp. 73-104). New York: Springer International Publishing. https://doi.org/10.1007/978-3-030-33502-1_3

Dosi, G. (1982). Technological paradigms and technological trajectories. Research Policy, 11(3), 147-162. https://doi.org/http://dx.doi.org/10.1016/0048-7333(82)90016-6

Dutta, N., & Meierrieks, D. (2021). Financial development and entrepreneurship. International Review of Economics & Finance, 73, 114-126. https://doi.org/10.1016/j.iref.2021.01.002

Edquist, C. (1997). Systems of Innovation: Technologies, Institutions, and Organizations (1st ed.). London, England: Pinter Publisher Ltd.

Farinha, L., Lopes, J., Bagchi-Sen, S., Sebastião, J. R., & Oliveira, J. (2020). Entrepreneurial dynamics and government policies to boost entrepreneurship performance. Socio-Economic Planning Sciences, 72, 100950.

https://doi.org/10.1016/j.seps.2020.100950

Feld, B. (2012). Startup Communities: Building an Entrepreneurial Ecosystem in Your City. New Jersey, USA: John Wiley & Sons.

Fredström, A., Peltonen, J., & Wincent, J. (2021). A country-level institutional perspective on entrepreneurship productivity: The effects of informal economy and regulation. Journal of Business Venturing, 36(5), 1-15. https://doi.org/10.1016/j.jbusvent.2020.106002

Freeman, C. (1995). The national system of innovation in historical perspective. Cambridge Journal of Economics, 19(1), 5-24.

Fuster, E., Padilla-Meléndez, A., Lockett, N., & Del-Águila-Obra, A. R. (2019). The emerging role of university spin-off companies in developing regional entrepreneurial university ecosystems: The case of Andalusia. Technological Forecasting and Social Change, 141, 219-231. https://doi.org/10.1016/j.techfore.2018.10.020

GEM. (2017). Global Report 2016/17. Global Entrepreneurship Research Association. Retrived from https://www.gemconsortium.org/file/open?fileId=49812

González-Uribe, J., & Reyes, S. (2021). Identifying and boosting “Gazelles”: Evidence from business accelerators. Journal of Financial Economics, 139(1), 260-287.

https://doi.org/10.1016/j.jfineco.2020.07.012

Gudergan, S. P., Ringle, C. M., Wende, S., & Will, A. (2008). Confirmatory tetrad analysis in PLS path modeling. Journal of Business Research, 61(12), 1238-1249.

https://doi.org/10.1016/j.jbusres.2008.01.012

Hair, J. F., Hult, T. G., Ringle, C. M., & Sarstedt, M. (2017). Primer on Partial Least Squares Structural (PLS-SEM) (2nd ed.). Thousand Oaks, California, USA: Sage Publications Inc.

Hamdi-Kidar, L., & Vellera, C. (2018). Triggers entrepreneurship among creative consumers. Journal of Business Research, 92, 465-473. https://doi.org/10.1016/j.jbusres.2018.07.018

Huynh, T., Patton, D., Arias-Aranda, D., & Molina-Fernández, L. M. (2017). University spin-off’s performance: Capabilities and networks of founding teams at creation phase. Journal of Business Research, 78, 10-22. https://doi.org/10.1016/j.jbusres.2017.04.015

Inácio Jr., E., Dionisio, E. A., Fischer, B. B., Li, Y., & Meissner, D. (2021). The global entrepreneurship index as a benchmarking tool? Criticisms from an efficiency perspective. Journal of Intellectual Capital, 22(1), 190-212. https://doi.org/10.1108/JIC-09-2019-0218

Isenberg, D. J. (2010). How to Start an Entrepreneurial Revolution. Harvard Business Review, 88(6), 40-50.

Kantis, H., Federico, J., & García, S. I. (2018). Opening the black box of ecosystem diversity around the globe: The Index of Dynamic Entrepreneurship (IDE) (1st ed.). Santa Fé, Argentina: Asociación Civil Red Pymes Mercosur.

Kaya, M. C., & Persson, L. (2019). A theory of gazelle growth: Competition, venture capital finance and policy. The North American Journal of Economics and Finance, 50, 101019. https://doi.org/10.1016/j.najef.2019.101019

Kline, S. J., & Rosenberg, N. (1986). An Overview of Innovation. In R. Landau & N. Rosenberg (Eds.), The Positive Sum Strategy: Harnessing Technology for Economic Growth (275-306). Washington, USA: National Academy of Sciences.

Krugman, P. (1991). Increasing returns and economic geography. The Journal of Political Economy, 99(3), 483-499.

Kuratko, D. F. (2009). The entrepreneurial imperative of the 21st century. Business Horizons, 52(5), 421-428. https://doi.org/10.1016/j.bushor.2009.04.006

Kurato, D. F., & Covin, J. G. (2008). The concept of corporate entrepreneurship. In V. K. Narayanan & G. G. O’Connor (Eds.), Encyclopedia of technology and innovation management (pp. 207-214). New Jersey, USA: Blackwell Publishers.

Lafuente, E., Ács, Z. J., Sanders, M., & Szerb, L. (2020). The global technology frontier: productivity growth and the relevance of Kirznerian and Schumpeterian entrepreneurship. Small Business Economics, 55(1), 153-178. https://doi.org/10.1007/s11187-019-00140-1

Lafuente, E., Szerb, L., & Ács, Z. J. (2016). Country level efficiency and national systems of entrepreneurship: a data envelopment analysis approach. The Journal of Technology Transfer, 41(6), 1260-1283. https://doi.org/10.1007/s10961-015-9440-9

Landström, H., Åström, F., & Harirchi, G. (2015). Innovation and entrepreneurship studies: one or two fields of research? International Entrepreneurship and Management Journal, 11(3), 493-509. https://doi.org/10.1007/s11365-013-0282-3

Lassalle, P., Johanson, M., Nicholson, J. D., & Ratajczak-Mrozek, M. (2020). Migrant entrepreneurship and markets: The dynamic role of embeddedness in networks in the creation of opportunities. Industrial Marketing Management, 91, 523-536. https://doi.org/10.1016/j.indmarman.2020.04.009

Lattacher, W., Gregori, P., Holzmann, P., & Schwarz, E. J. (2021). Knowledge spillover in entrepreneurial emergence: A learning perspective. Technological Forecasting and Social Change, 166, 1-13. https://doi.org/10.1016/j.techfore.2021.120660

Lederman, D., Messina, J., Pienknagura, S., & Rigolini, J. (2014). Latin American Entrepreneurs: many firms but little innovation. Washington, D.C., USA: The World Bank. https://doi.org/10.1596/978-1-4648-0012-2

Leendertse, J., Schrijvers, M., & Stam, E. (2021). Measure Twice, Cut Once: Entrepreneurial Ecosystem Metrics. Research Policy, Online. https://doi.org/10.1016/j.respol.2021.104336

Lundvall, B.-Å. (1992). National Systems of Innovation: Towards a Theory of Innovation and Interactive Learning (1st ed.). London: Pinter Publishers.

Malerba, F., & McKelvey, M. (2020). Knowledge-intensive innovative entrepreneurship integrating Schumpeter, evolutionary economics, and innovation systems. Small Business Economics, 54(2), 503-522. https://doi.org/10.1007/s11187-018-0060-2

Malerba, F., & Pisano, G. P. (2019). Innovation, competition and sectoral evolution: an introduction to the special section on Industrial Dynamics. Industrial and Corporate Change, 28(3), 503-510. https://doi.org/10.1093/icc/dtz017

Mason, C., & Brown, R. (2014). Entrepreneurial ecosystems and growth-oriented enterprises. Berlin: OECD Publishing.

Neill, S., Metcalf, L. E., & York, J. L. (2017). Distinguishing entrepreneurial approaches to opportunity perception. International Journal of Entrepreneurial Behavior & Research, 23(2), 296-316. https://doi.org/10.1108/IJEBR-05-2016-0162

Nelson, R. R. (1993). National innovation systems: a comparative analysis (1st ed.). Oxford, UK: Oxford University Press.

OECD. (2008). Handbook on Constructing Composite Indicators: Methodology and User Guide. European Union: OECD Publishing.

Omri, A. (2020). Formal versus informal entrepreneurship in emerging economies: The roles of governance and the financial sector. Journal of Business Research, 108, 277-290. https://doi.org/10.1016/j.jbusres.2019.11.027

Ordeñana, X., Vera-Gilces, P., Zambrano-Vera, J., & Amaya, A. (2019). Does all entrepreneurship matter? The contribution of entrepreneurial activity to economic growth. Academia Revista Latinoamericana de Administración, 33(1), 25-48. https://doi.org/10.1108/ARLA-11-2018-0256

Radosevic, S., & Yoruk, E. (2013). Entrepreneurial propensity of innovation systems: Theory, methodology and evidence. Research Policy, 42(5), 1015-1038.

https://doi.org/10.1016/j.respol.2013.01.011

Roundy, P. T., Bradshaw, M., & Brockman, B. K. (2018). The emergence of entrepreneurial ecosystems: A complex adaptive systems approach. Journal of Business Research, 86, 1-10. https://doi.org/https://doi.org/10.1016/j.jbusres.2018.01.032

Salman, D. M. (2016). What is the role of public policies to robust international entrepreneurial activities on economic growth? Evidence from cross countries study. Future Business Journal, 2(1), 1-14. https://doi.org/10.1016/j.fbj.2016.02.001

Schumpeter, J. A. (1949). Economic Theory and Entrepreneurial History. In J. A. Schumpeter (Ed.), Change and the Entrepreneur: postulates and patterns of entrepreneurial history (pp. 63-84). Cambridge, MA, USA: Harvard University Press.

Schumpeter, J. A. (2011). The Theory of Economic Development: An Inquiry into Profits, Capital, Credit, Interest, and the Business Cycle (1st ed.). New Jersey, USA: Transaction Publishers.

Shane, S. (2009). Why encouraging more people to become entrepreneurs is bad public policy. Small Business Economics, 33(2), 141-149. https://doi.org/10.1007/s11187-009-9215-5

Sousa-Ginel, E., Franco-Leal, N., & Camelo-Ordaz, C. (2021). Knowledge conversion capability and networks as drivers of innovation in Academic Spin-Offs. Journal of Engineering and Technology Management, 59, 101615. https://doi.org/10.1016/j.jengtecman.2021.101615

Spigel, B., & Harrison, R. (2018). Toward a process theory of entrepreneurial ecosystems. Strategic Entrepreneurship Journal, 12(1), 151-168. https://doi.org/10.1002/sej.1268

Stam, E. (2015). Entrepreneurial Ecosystems and Regional Policy: A Sympathetic Critique. European Planning Studies, 23(9), 1759-1769. https://doi.org/10.1080/09654313.2015.1061484

Stam, E., & Van de Ven, A. (2021). Entrepreneurial ecosystem elements. Small Business Economics, 56(2), 809-832. https://doi.org/10.1007/s11187-019-00270-6

Sternberg, R., Bloh, J. von, & Coduras, A. (2019). A new framework to measure entrepreneurial ecosystems at the regional level. Zeitschrift Für Wirtschaftsgeographie, 63(2-4), 103-117. https://doi.org/10.1515/zfw-2018-0014

Steruska, J., Simkova, N., & Pitner, T. (2019). Do science and technology parks improve technology transfer? Technology in Society, 59, 101127. https://doi.org/10.1016/j.techsoc.2019.04.003

Szerb, L., Ács, Z. J., Autio, E., Ortega-Argilés, R., & Komlósi, É. (2014). REDI: The Regional Entrepreneurship and Development Index - Measuring regional entrepreneurship. Luxembourg: Publications Office of the European Union. https://doi.org/10.2776/79241

Szerb, L., Ortega‐Argilés, R., Ács, Z. J., & Komlósi, É. (2020). Optimizing entrepreneurial development processes for smart specialization in the European Union. Papers in Regional Science, 99(5), 1413-1457. https://doi.org/10.1111/pirs.12536

Szerb, L., & Trumbull, W. N. (2018). Entrepreneurship development in Russia: is Russia a normal country? An empirical analysis. Journal of Small Business and Enterprise Development, 25(6), 902-929. https://doi.org/10.1108/JSBED-01-2018-0033

Tavassoli, S., Obschonka, M., & Audretsch, D. B. (2021). Entrepreneurship in Cities. Research Policy, 50(7), 104255.

https://doi.org/10.1016/j.respol.2021.104255

Ha, N. T. T., & Hoa, L. B. (2018). Evaluating entrepreneurship performance in Vietnam through the global entrepreneurship development index approach. Journal of Developmental Entrepreneurship, 23(01), 1–19. https://doi.org/10.1142/S1084946718500061.

Udimal, T. B., Luo, M., Liu, E., & Mensah, N. O. (2020). How has formal institutions influenced opportunity and necessity entrepreneurship? The case of brics economies. Heliyon, 6(9), e04931. https://doi.org/10.1016/j.heliyon.2020.e04931

WEF. (2017). The global competitiveness report 2017-2018. Cologny, Suíça: The World Economic Forum.

Welter, C., & Alvarez, S. (2015). The state of opportunities: clarifying the transitions between opportunity types. Management Decision, 53(7), 1398-1411. https://doi.org/10.1108/MD-07-2014-0466

Wood, M. S., & Mckinley, W. (2017). After the Venture: The Reproduction and Destruction of Entrepreneurial Opportunity. Strategic Entrepreneurship Journal, 11(1), 18-35. https://doi.org/10.1002/sej.1238

Xie, K., Song, Y., Zhang, W., Hao, J., Liu, Z., & Chen, Y. (2018). Technological entrepreneurship in science parks: A case study of Wuhan Donghu High-Tech Zone. Technological Forecasting and Social Change, 135, 156-168.

https://doi.org/10.1016/j.techfore.2018.01.021

Zheng, S., & Du, R. (2020). How does urban agglomeration integration promote entrepreneurship in China? Evidence from regional human capital spillovers and market integration. Cities, 97, 102529. https://doi.org/10.1016/j.cities.2019.102529

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22-09-2022

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Avancci Dionisio, E., Silva, D., Quadros Carvalho, R., & Inácio Júnior, E. (2022). Avaliação da validade do Global Entrepreneurship Index. REGEPE Entrepreneurship and Small Business Journal, 11(2), e2050. https://doi.org/10.14211/ibjesb.e2050

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