A Multilevel Analysis of Innovation in Developing Countries
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- Martin Srholec, 2011. "A multilevel analysis of innovation in developing countries ," Industrial and Corporate Change, Oxford University Press and the Associazione ICC, vol. 20(6), pages 1539-1569, December.
- Srholec, Martin, 2008. "A multilevel analysis of innovation in developing countries," MERIT Working Papers 2008-040, United Nations University - Maastricht Economic and Social Research Institute on Innovation and Technology (MERIT).
- Martin Srholec, 2008. "A multilevel analysis of innovation in developing countries," Working Papers on Innovation Studies 20080812, Centre for Technology, Innovation and Culture, University of Oslo.
References listed on IDEAS
- Jacques Mairesse & Pierre Mohnen, 2002. "Accounting for Innovation and Measuring Innovativeness: An Illustrative Framework and an Application," American Economic Review, American Economic Association, vol. 92(2), pages 226-230, May.
- Mohnen, Pierre & Roller, Lars-Hendrik, 2005.
"Complementarities in innovation policy,"
European Economic Review, Elsevier, vol. 49(6), pages 1431-1450, August.
- Pierre Mohnen & Lars-Hendrik Röller, 2000. "Complementarities in Innovation Policy," CIG Working Papers FS IV 00-18, Wissenschaftszentrum Berlin (WZB), Research Unit: Competition and Innovation (CIG).
- Mohnen, Pierre & Roeller, Lars-Hendrik, 2003. "Complementarities in Innovation Policy," Research Memorandum 025, Maastricht University, Maastricht Economic Research Institute on Innovation and Technology (MERIT).
- Pierre Mohnen & Lars-Hendrick Röller, 2003. "Complementarities in Innovation Policy," CIRANO Working Papers 2003s-60, CIRANO.
- Röller, Lars-Hendrik & Mohnen, Pierre, 2001. "Complementarities in Innovation Policy," CEPR Discussion Papers 2712, C.E.P.R. Discussion Papers.
- Pierre Mohnen & Lars-Hendrick Röller, 2001. "Complementarities in Innovation Policy," CIRANO Working Papers 2001s-28, CIRANO.
- Simeon Djankov & Rafael La Porta & Florencio Lopez-de-Silanes & Andrei Shleifer, 2002.
"The Regulation of Entry,"
The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 117(1), pages 1-37.
- Simeon Djankov & Rafael LaPorta & Florencio Lopez-de-Silanes & Andrei Shleifer, "undated". "The Regulation of Entry," Working Paper 19462, Harvard University OpenScholar.
- Djankov, Simeon & La Porta, Rafael & Lopez-de-Silanes, Florencio & Shleifer, Andrei, 2001. "The Regulation of Entry," CEPR Discussion Papers 2953, C.E.P.R. Discussion Papers.
- Simeon Djankov & Rafael La Porta & Florencio Lopez-de-Silanes & Andre Shleifer, 2000. "The Regulation of Entry," Harvard Institute of Economic Research Working Papers 1904, Harvard - Institute of Economic Research.
- Djankov, Simeon & La Porta, Rafael & Shleifer, Andrei & Lopez de Silanes, Florencio, 2001. "The regulation of entry," Policy Research Working Paper Series 2661, The World Bank.
- Djankov, Simeon & La Porta, Rafael & Lopez-de-Silanes, Florencio & Shleifer, Andrei, 2001. "The Regulation of Entry," Working Paper Series rwp01-015, Harvard University, John F. Kennedy School of Government.
- Simeon Djankov & Rafael La Porta & Florencio LopezdeSilanes & Andrei Shleifer, 2000. "The Regulation of Entry," NBER Working Papers 7892, National Bureau of Economic Research, Inc.
- Djankov, S. & La Porta, R. & Lopez-de-Silanes, F. & Shleifer, Andrei, 2002. "The Regulation of Entry," Scholarly Articles 30747190, Harvard University Department of Economics.
- Jan Fagerberg & Bart Verspagen & G. N. von Tunzelmann (ed.), 1994. "The Dynamics Of Technology, Trade And Growth," Books, Edward Elgar Publishing, number 163.
- Pierre Mohnen & Jacques Mairesse & Marcel Dagenais, 2006.
"Innovativity: A comparison across seven European countries,"
Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 15(4-5), pages 391-413.
- Pierre Mohnen & Jacques Mairesse & Marcel Dagenais, 2006. "Innovativity: A Comparison Across Seven European Countries," NBER Working Papers 12280, National Bureau of Economic Research, Inc.
- Pierre Mohnen & Jacques Mairesse & Marcel Dagenais, 2006. "Innovativity: A Comparison Across Seven European Countries," CIRANO Working Papers 2006s-11, CIRANO.
- Mohnen, Pierre & Mairesse, Jacques & Dagenais, Marcel, 2006. "Innovativity: A comparison across seven European countries," MERIT Working Papers 2006-027, United Nations University - Maastricht Economic and Social Research Institute on Innovation and Technology (MERIT).
- Pierre Mohen & Jacques Mairesse & Marcel Dagenais, 2006. "Innovativity : A Comparison Across Seven European Countries," Working Papers 2006-15, Center for Research in Economics and Statistics.
- Bengt-åke Lundvall & Jan Vang & K.J. Joseph, 2009. "Innovation System Research and Developing Countries," Chapters, in: Bengt-Åke Lundvall & K. J. Joseph & Cristina Chaminade & Jan Vang (ed.), Handbook of Innovation Systems and Developing Countries, chapter 1, Edward Elgar Publishing.
- Fagerberg, Jan & Srholec, Martin & Knell, Mark, 2007. "The Competitiveness of Nations: Why Some Countries Prosper While Others Fall Behind," World Development, Elsevier, vol. 35(10), pages 1595-1620, October.
- Kim, Linsu, 1980. "Stages of development of industrial technology in a developing country: A model," Research Policy, Elsevier, vol. 9(3), pages 254-277, July.
- Juan C. Botero & Simeon Djankov & Rafael La Porta & Florencio Lopez-de-Silanes & Andrei Shleifer, 2004.
"The Regulation of Labor,"
The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 119(4), pages 1339-1382.
- Juan Botero & Simeon Djankov & Rafael LaPorta & Florencio López-de-Silanes & Andrei Shleifer, "undated". "The Regulation of Labor," Working Paper 19483, Harvard University OpenScholar.
- Botero, J. C. & Djankov, S. & Porta, R. L. & Lopez-de-Silanes, F. & Shleifer, Andrei, 2004. "The Regulation of Labor," Scholarly Articles 27867241, Harvard University Department of Economics.
- Simeon Djankov & Rafael La Porta & Florencio Lopez-de-Silane & Andrei Shleifer & Juan Botero, 2003. "The Regulation of Labor," NBER Working Papers 9756, National Bureau of Economic Research, Inc.
- Rachel Griffith & Elena Huergo & Jacques Mairesse & Bettina Peters, 2006.
"Innovation and Productivity Across Four European Countries,"
Oxford Review of Economic Policy, Oxford University Press and Oxford Review of Economic Policy Limited, vol. 22(4), pages 483-498, Winter.
- Rachel Griffith & Elena Huergo & Jacques Mairesse & Bettina Peters, 2006. "Innovation and Productivity across Four European Countries," NBER Working Papers 12722, National Bureau of Economic Research, Inc.
- Fagerberg, Jan, 1987.
"A technology gap approach to why growth rates differ,"
Research Policy, Elsevier, vol. 16(2-4), pages 87-99, August.
- Jan Fagerberg, 1987. "A technology gap approach to why growth rates differ," Working Papers Archives 1987002, Centre for Technology, Innovation and Culture, University of Oslo.
- Martin Srholec, 2009. "Does foreign ownership facilitate cooperation on innovation? Firm-level evidence from the enlarged European Union," The European Journal of Development Research, Palgrave Macmillan;European Association of Development Research and Training Institutes (EADI), vol. 21(1), pages 47-62, February.
- Hobday, Mike, 1995. "East Asian latecomer firms: Learning the technology of electronics," World Development, Elsevier, vol. 23(7), pages 1171-1193, July.
- Fulvio Castellacci, 2007.
"Evolutionary And New Growth Theories. Are They Converging?,"
Journal of Economic Surveys, Wiley Blackwell, vol. 21(3), pages 585-627, July.
- Castellacci, Fulvio, 2006. "Evolutionary and new growth theories: are they converging?," MPRA Paper 27602, University Library of Munich, Germany.
- Archibugi, Daniele & Coco, Alberto, 2004.
"A New Indicator of Technological Capabilities for Developed and Developing Countries (ArCo),"
World Development, Elsevier, vol. 32(4), pages 629-654, April.
- Daniele Archibugi & Alberto Coco, 2004. "A New Indicator of Technological Capabilities for Developed and Developing Countries (ArCo)," SPRU Working Paper Series 111, SPRU - Science Policy Research Unit, University of Sussex Business School.
- Daniele Archibugi & Alberto Coco, 2004. "A New Indicator of Technological Capabilities for Developed and Developing Countries (ArCo)," CEIS Research Paper 44, Tor Vergata University, CEIS.
- Micheline Goedhuys & Norbert Janz & Pierre Mohnen, 2014.
"Knowledge-based productivity in "low-tech" industries: evidence from firms in developing countries,"
Industrial and Corporate Change, Oxford University Press and the Associazione ICC, vol. 23(1), pages 1-23, February.
- Goedhuys, Micheline & Janz, Norbert & Mohnen, Pierre, 2008. "Knowledge-based productivity in low-tech industries: evidence from firms in developing countries," MERIT Working Papers 2008-007, United Nations University - Maastricht Economic and Social Research Institute on Innovation and Technology (MERIT).
- Lall, Sanjaya, 1992. "Technological capabilities and industrialization," World Development, Elsevier, vol. 20(2), pages 165-186, February.
- Rita Almeida & Ana Margarida Fernandes, 2008.
"Openness and Technological Innovations in Developing Countries: Evidence from Firm-Level Surveys,"
Journal of Development Studies, Taylor & Francis Journals, vol. 44(5), pages 701-727.
- Almeida, Rita & Fernandes, Ana Margarida, 2006. "Openness and technological innovations in developing countries : evidence from firm-level surveys," Policy Research Working Paper Series 3985, The World Bank.
- Almeida, Rita K. & Fernandes, Ana Margarida, 2007. "Openness and Technological Innovations in Developing Countries: Evidence from Firm-Level Surveys," IZA Discussion Papers 2907, Institute of Labor Economics (IZA).
- W. J. Henisz, 2000. "The Institutional Environment for Economic Growth," Economics and Politics, Wiley Blackwell, vol. 12(1), pages 1-31, March.
- Peters, Bettina & Lööf, Hans & Janz, Norbert, 2003.
"Firm Level Innovation and Productivity: Is there a Common Story Across Countries?,"
ZEW Discussion Papers
03-26, ZEW - Leibniz Centre for European Economic Research.
- Janz, Norbert & Lööf, Hans & Peters, Bettina, 2004. "Firm Level Innovation and Productivity - Is there a Common Story Across Countries?," Working Paper Series in Economics and Institutions of Innovation 24, Royal Institute of Technology, CESIS - Centre of Excellence for Science and Innovation Studies.
- Fagerberg, Jan & Srholec, Martin, 2008.
"National innovation systems, capabilities and economic development,"
Research Policy, Elsevier, vol. 37(9), pages 1417-1435, October.
- Jan Fagerberg & Martin Srholec, 2007. "National innovation systems, capabilities and economic development," Working Papers on Innovation Studies 20071024, Centre for Technology, Innovation and Culture, University of Oslo.
- Bengt-Åke Lundvall & K. J. Joseph & Cristina Chaminade & Jan Vang (ed.), 2009. "Handbook of Innovation Systems and Developing Countries," Books, Edward Elgar Publishing, number 12943.
- Jan Fagerberg & Manuel Godinho, 2003. "Innovation and catching-up," Working Papers 24, Centre for Technology, Innovation and Culture, University of Oslo.
- Daniel Lederman, 2010. "An international multilevel analysis of product innovation," Journal of International Business Studies, Palgrave Macmillan;Academy of International Business, vol. 41(4), pages 606-619, May.
- Abramovitz, Moses, 1986. "Catching Up, Forging Ahead, and Falling Behind," The Journal of Economic History, Cambridge University Press, vol. 46(2), pages 385-406, June.
- David Draper, 1995. "Inference and Hierarchical Modeling in the Social Sciences," Journal of Educational and Behavioral Statistics, , vol. 20(2), pages 115-147, June.
- Rinaldo Evangelista & Simona Iammarino & Valeria Mastrostefano & Alberto Silvani, 2002. "Looking for Regional Systems of Innovation: Evidence from the Italian Innovation Survey," Regional Studies, Taylor & Francis Journals, vol. 36(2), pages 173-186.
- World Bank, 2009. "World Development Indicators 2009," World Bank Publications - Books, The World Bank Group, number 4367.
- Dahlman, Carl J. & Ross-Larson, Bruce & Westphal, Larry E., 1987. "Managing technological development: Lessons from the newly industrializing countries," World Development, Elsevier, vol. 15(6), pages 759-775, June.
- Furman, Jeffrey L. & Porter, Michael E. & Stern, Scott, 2002. "The determinants of national innovative capacity," Research Policy, Elsevier, vol. 31(6), pages 899-933, August.
- Tommy Clausen, 2008. "Search Pathways to Innovation," Working Papers on Innovation Studies 20080311, Centre for Technology, Innovation and Culture, University of Oslo.
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More about this item
Keywords
innovation; technological capability; multilevel modeling; institutions; developing countries;All these keywords.
JEL classification:
- O12 - Economic Development, Innovation, Technological Change, and Growth - - Economic Development - - - Microeconomic Analyses of Economic Development
- O14 - Economic Development, Innovation, Technological Change, and Growth - - Economic Development - - - Industrialization; Manufacturing and Service Industries; Choice of Technology
- C39 - Mathematical and Quantitative Methods - - Multiple or Simultaneous Equation Models; Multiple Variables - - - Other
- O31 - Economic Development, Innovation, Technological Change, and Growth - - Innovation; Research and Development; Technological Change; Intellectual Property Rights - - - Innovation and Invention: Processes and Incentives
- O43 - Economic Development, Innovation, Technological Change, and Growth - - Economic Growth and Aggregate Productivity - - - Institutions and Growth
NEP fields
This paper has been announced in the following NEP Reports:- NEP-INO-2011-03-26 (Innovation)
- NEP-KNM-2011-03-26 (Knowledge Management and Knowledge Economy)
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