The Combined Effects of Public and Private Investments on Economic Growth in the CEMAC Zone


  • Noula Armand Gilbert Faculty of Economics and Management, University of Dschang, Cameroon
  • Chouafi Nguekam Orfé Faculty of Economics and Management, University of Dschang, Cameroon
  • Kamajou François Faculty of Economics and Management, University of Dschang, Cameroon



This study evaluates the simultaneous impact of public and private investments on economic growth in the CEMAC zone between 1984 and 2017.To attain this aim, we use the Vector Error Correction Model (VECM) to test the direction of causality between the three variables above at the level of each country. We find that the direction of causality is not the same in all the countries both in the short as in long-run. We then develop an ideal model going from the Cobb Douglas production function which we quantitatively validate using panel data estimation through the method of Pool Mean Group which takes into account individual specificities. It arises that contrary to economic theory, private sector investments have positive and significant effects in short-run. However, the impact of public investments is negative and significant. In the long-run, the effects are reversed and call on the authorities of the CEMAC zone to reinforce the political risk to strengthen the public-private partnership in the process of sustainable growth.


Public-private investment, Economic growth


[1] Acemoglu D. and Zilibotti F..Was Prometheus Unbound by chance? Risk, diversification and growth, Journal of Political Economy, 1997, 4(105): 709-751.


[3] African Development Bank.AfDB Rapport annuel, 2017.


[5] African Development Bank. Perspectives économiques en Afrique centrale, 2019.


[7] Akpan G. E. &Akpan U. F..Electricity Consumption, Carbon Emissions and Economic Growth in Nigeria.International Journal of Energy Economics and Policy, 2012, 4(2): 292-306.

[8] Aregbeyen O..Cointegration, and Wagner’s Law: A test for Nigeria.Economic and Financial Review, 2008, 44(2): 1-17.

[9] Aschauer D..Does public capital crowd out private capital? Journal of Monetary Economics, 1988, 24: 171-188.

[10] Ashwani B. and Sheera V. P.. Public spending and economic growth for Indian states. International Journal of Public Sector Performance Management, 2017, 3: 250-265.

[11] Aubyn M.S. and Afonso A.. Macroeconomic Rates of Return of Public and Private Investment: Crowding- in and Crowding –out Effects. Department of Economics, Technical University of Lisbon, Working Paper Number WP/06/2008/DE/UECE., 2008.


[13] Avom D. and Song S..Institutions économiques, capital humain et croissance économique en Afrique au Sud du Sahara.Journal of Economic Literature, 2010, 6(3): 21-26.

[14] Banque Mondiale. Qualité de la croissance. Bruxelles, De Boeck Université, 2002: 282 p.

[15] Barro R. J. and Sala-i-Martin X.. Technological diffusion, convergence and growth, NBER Working Paper, 1995, 5151: 1-45.

[16] Doi: 10.3386/w5151

[17] Barro, R., J.. Economic Growth in a Cross Section of Countries. Quartely Journal of Economics, 1991, 2(106): 407-443.


[19] Baye M. F..Growth and Redistribution Effects of Poverty Changes in Cameroon: A Shapley Decomposition Analysis. Forum Paper, Development Policy Research Unit, 2004.

[20] Bayraktar N. and Moreno-Dodson B..How can public spending help you? An empirical analysis for developing countries. Bulletin of Economic Research, 2015, 67: 30-64.

[21] Berthélemy J-C and Varoudakis A.. Développement financier, réformes financières et croissance: une approche en données de panel, Revue Economique, 1998, 49(1): 195-206.

[22] Bikai J. L. and Kamgna Y. S.. Effets de seuils de l’inflation sur l’activité économique en CEMAC. Journées Internationales du Risque, Niort 25 et 26 Mai, 2011.

[23] Bom, P., and Ligthart E. J.. How Productive Is Public Capital? A Meta-Regression Analysis, Working Paper, 2008, 2206: 1-37.

[24] Borensztein E. J., DeGregorio J. and Lee J. W.. How does foreign direct investment affect economic growth. Journal of International Economics, 1998, 45L 115-135.


[26] Brewer T.. Foreign direct investment in developing countries: patterns, policies and prospects’’, PRE working paper, 1991, 34.

[27] Calderon C., Moral-Benito E. and Serven L.. Is Infrastructure Capital Productive? A Dynamic Heterogeneous Approach. Journal of Applied Econometrics, 2015, 2(30): 98-177.


[29] Canh T. N. and Phong A. N.. Effect of public investment on private investment and economic growth: Evidence from Vietnam by economic industries, Applied Economics and Finance, 2018: 2(5). ISSN 2332-7308.


[31] Cantu C.. Defining infrastructure and its effects on economic growth, Equilibrio Economico, Revista de Economia, Politica y Sociedad, 2017, 13(1): 77-104.

[32] Cavallo A. E. and Daude C..Public investment in developing countries: A blessing or a curse? Inter-American Development Bank Working Paper, 2011, 547: 42.

[33] Chamois P. O.. Government Expenditure and National income: A Causality Test for Nigeria, European Journal of Economic and Political Studies, 2009, 2(2): 1-11.

[34] Dabla-Norris, E., Brumby J., Kyobe A., Mills, C. and Papageorgiou. Investing in public Investment: An Index of Public Investment Efficiency, IMF Working Paper, 2011: 1-43.

[35] Dikeogu C. C., Ohale L., Otto G.. Public expenditure and economic growth in Nigeria. International Journal of Advanced Academic Research, 2016.

[36] Djankov S., Saliola F. and Islam A.. Is Public Procurement a Rich Country’s Policy? Banque Mondiale, Governance for Development Blog, 2016.

[37] country-s-policy

[38] Dollar D. and Kraay A.. Growth is good for the poor. Journal of Economic Growth, 2002, 3(7): 195-225.

[39] Dreger C. and Reimers H. E.. On the relationship between public and private investment in the euro area. Discussion Papers, DIW Berlin, 2014.


[41] Dreger C. and Reimers H. E.. Does public investment stimulate private investment? Evidence for the euro area. Economic Modelling, 2016, 58: 154-158.


[43] Easterly W. and Rebelo S.. Fiscal policy and economic growth: an empirical investigation. Journal of Monetary Economics, 1993, 32: 417-458.

[44] FMI. Enhanced structural adjustment facility economic and financial, Policy Framework Paper, 1999.

[45] FMI. Making Public Investment More Efficient. Washington, DC: FMI, 2015.

[46] Fouopi D., Ella P., Ndoumba J. M., Ella N. P. and Ngah B. E..Dépenses publiques et croissance économique dans les pays de la CEMAC, Premier Colloque de l’association d’économie théorique et appliquée, 2016.

[47] et al..pdf

[48] Fouopi, D., Ella, P., Ndoumba J. M., Ella N. P. et Ngah B. E.. Effets de seuil des dépenses publiques sur la croissance économique dans les pays de la CEMAC,WorkingPaper, 2014: 1-30.


[50] Foye O. V.. The impact of public capital spending on private investment in Nigeria. Journal of International Academic Research for Multidisciplinary, 2014, 2(2): 86-100.

[51] Getachew Z..The Impacts of Investment on Economic growth in Ethiopia. Doctoral dissertation, Addis Ababa University, Department of Economics, 2014.

[52] Ghura D. and Hadjimichael M.. Growth in Sub-Saharan Africa, IMF Staff Papers, 1996, 43: 605-631.


[54] Gjini A. and Kukeli A.. Crowding-out effect of public investment on private investment: An empirical investigation, Journal of Business and Economics Research, 2012.


[56] Greene J. and Villanueva D.. Private investment in developing countries: an empirical analysis, IMF Staff Papers, Palgrave Macnillan, 1991, 38(1): 33-58.

[57] Hague S. T.. Effect of Public and Private Investment on Economic Growth in Bangladesh: An Econometric Analysis, Research Study Series No FDRS05/2013, Finance Division, Ministry of Finance, 2013.


[59] Hansen M. N.. Unbalanced growth and regional development, Economic Inquiry, 1965: 1(4).

[60] Helpman E. and Grossman M. G.. Endogenous innovation in the theory of growth. Journal of Economic Perspectives, 1994, 8(1): 23-44. Doi:10.1257/jep.8.1.23

[61] Hussein J. and Benhin J.. Public and Private Investment and Economic Development in Iraq (19702010).International Journal of Social Science and Humanity, 2015,5(9): 743.

[62] ICRG. International country risk guide. Researcher dataset, 2017.

[63] Iheanacho E.. The contribution of government expenditure on economic growth of Nigeria Disaggregated Approach. Int J Eco Manag Sci, 2016.

[64] Imoisi A. I., Abuo M. and Sogules I. W.. Domestic investment and economic growth in Nigeria from 1970-2013: An econometric analysis. Canadian Social Science, 2015, 6(11), 70-79.

[65] Doi:

[66] Kao C.. Spurious regression and residual-based tests for cointegration in panel data. Journal of Econometrics, 1999, 90: 1-44.


[68] Khan M. and Blejer M.. Government Policy and Private Investment in Developing Countries, IMF Staff Papers, 1984, 31: 379-403.


[70] Khan M. S. and Kumar M.S.. Public and Private Investment and the Growth Process in Developing Countries. Oxford Bulletin of Economics and Statistics, 1997, 59(1): 69-88.

[71] Knight M., Loaza N. and Villanueva D.. Testing the neoclassical theory of economic growth: A panel data approach, IMF Staff Papers, 1993, 3(40): 512-541.


[73] Koffi Y.. Public expenditures, private investment and economic growth in Togo. Theoretical Economics Letters, 2017, 2(7): 193-209.

[74] DOI: 10.4236/tel.2017.72017

[75] Kouassi B. K.. Public spending and economic growth countries: a synthesis. Financial Markets, Institutions and Risks, 2018, 2(2): 22-30.

[76] Lucas R. E.. On the Mechanics of Economic Development. Journal of Monetary Economics, 1988, 22: 3-42.

[77] Mba F. andNgouhouo I.. Impact du crédit à l’économie sur l’inflation et la croissance au Cameroun.Global Journal of Economic and Management, 2013, 3(13): 23-45.

[78] Moussavou F.. Dépenses publiques et dynamique de croissance au Congo-Brazzaville.Annales de l’Université Marien NGOUABI, 2017, 17(1): 21-37.


[80] Narayan K. P. and Smyth R.. Dead man walking: An empirical reassessment of the deterrent effect of capital punishment using the bounds testing approach to cointegration. Applied Economics, 2006, 38: 1975-1989.


[82] Nelson M. and Singh D. R..The deficit-growth connection: some recent evidence from developing countries. Economic Development and Cultural Change, 1994, 1(43): 167-191.

[83] Nose M.. Enforcing public-private partnership contact: how fiscal institutions matter. IMF Working Paper17/243, Washington, DC, 2017.

[84] Obad J. and Jamal Y.. Impact des dépenses publiques sur la croissance économique au Maroc.International Journal of Innovation and Applied Studies, 2016, 16: 444-445.

[85] Odhiambo G.. Academic brain drain: impact and implications for public higher education quality in Kenya. Research in Comparative and International Education, 2013, 8(4): 510-523.

[86] doi: 10.2304/rcie.2013.8.4.510

[87] Olulu R. M., Erhieryovwe E. K. and Andrew U.. Government expenditure and economic growth: The Nigerian experience. Mediterranean Journal of Social Sciences, 5, 146.

[88] Osman E. G. A. 2014. The impact of private sector credit on Saudi Arabia Economic Growth (GDP): An Econometrics model using (ARDL) Approach to Cointegration.Am Int J Soc Sci 2014, 3(6): 109-117.

[89] Pédroni. Panel cointegration: Asymptotic and finite sample proprieties pooled tie series tests with an application to the PPP hypothesis. Econometric Theory, 2004, 20: 597-625.


[91] Pesaran M., Shin Y., Smith R.. Bounds Testing Approaches to the Analysis of Level Relationships. Journal of Applied Econometrics,1999, 16(3): 289-326.

[92] Phetsavong K. and Ichihashi M.. The Impact of Public and Private Investment on Economic Growth: Evidence from Developing Asian Countries, International Development and Cooperation, IDEC Discussion Paper 2012, Hiroshima University, 2012.


[94] Rajaram A., Kaiser, Kai-Alexander, Tuan M., Jay-Hyung , Jonas M.. The Power of Public Investment Management: Transforming Resources into Assets for Growth.Directions in development; public sector governance. Washington, DC, World Bank Group, 2014.

[95] Ramirez. Public capital formation and labor productivity growth in Chile. Contemporary Economic Policy, 2000, 2(18): 159-169.


[97] Romer P.. ‘‘Endogenous Technological Change’’, Journal of Political Economy, 1990, 5(98): S71-S102.

[98] 2929%3 A3%3C 155%3ATEIOLB%3E2.0.CO%3B2-%23

[99] Romps W. and De Haan J.. Public Capital and Economic Growth: A Critical Survey, European Investment Bank Papers, 2005, 10(1): 40-70.

[100] Saltz I. S.. Foreign direct investment and the distribution of income.Atlantic Economic Journal, 1992, 20(1).


[102] Samake I.. Investment and Growth Dynamics: An Empirical Assessment Applied to Benin, International Monetary Fund, IMF Working Paper Series, WP/08/120, 2008.


[104] Serven L. and Solimano A.. Private investment and macroeconomic adjustment: Theory, country experience and policy implication.Unpublished, Macroeconomic Adjustment and growth Division, World Bank, 1990.

[105] Siefu D. D., Njoke M. and Yah C. N.. Government spending and economic growth in Cameroon.European Scientific Journal, 28(14), 68-100, 2018.

[106] URL:https://dx.doi/org/10/19044/esj.2018.v14n28p68

[107] Sturm J., Kuperet G. and De Haan J.. Modelling government investment and economic growth on a macro level: A review and some new evidence.In Shibata H. and Ihori T., WELFARE STATE, PUBLIC INVESTMENT AND GROWTH. TOKYO Springer, 1998: 61-83.

[108] Suhendra I. and Anwar C. J. Determinants of private investment and the effects on economic growth in Indonesia. GSTF Journal on Business Review (GBR). 2014, 3(3): 127-130.

[109] World Bank.World development indicators. Washington DC: World Bank, 2017.

[110] Yang Z.. Empirical Studies on the Relationship Between Public and Private Investment and GDP Growth, Applied Economics, 2006, 38(1): 1259-1270.