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Purpose: The purpose of this paper is to analyze the differential impact each of the dominant theoretical explanations has on innovation persistence. The authors hereby differentiate the degree of novelty, distinguishing between innovation based on invention (new products for the international market) and those based on imitation or adoption processes (new products for the company or new products in the national market). Design/methodology/approach: Placing this study in the context of a developing country, the authors apply an ordered probit model inflated in zeros (ZIOP). This methodology enables one to not only provide results not biased by the excess of zeros but also take into account the unobserved heterogeneity with respect to the sources of zeros (that is those firms which do not innovate). The empirical analysis is based on three Colombian innovation surveys carried out between 2003 and 2008 by the Colombian National Statistics Department. Findings: The results provide empirical evidence that two elements are essential for both types of innovation persistence: accessing external financial resources and learning through interaction. Furthermore, the sunk R&D cost approach and technological learning explain persistence in innovation of new products for the international market. Research limitations/implications: The limitations of this study are directly related to the methodological choice. The authors were unable to take into consideration two sources of heterogeneity: the one related to initial conditions and the one related to the source of the many non-innovators. They opted to focus on the latter due the research question and setting of this study. Additionally, macroeconomic instability did not allow to consider a long panel; instead the authors had to rely on a short panel. Practical implications: The results provide important insights to managers. Continuous investments in innovation activities are important bot to become an innovative firm as well as to improve the odds of persistently innovating. Particularly, R&D investments are a pre-requisite for new-to-the-world innovations. Finally, it is not one specific set of capabilities which is a prerequisite for the generation of innovation; rather it is a strategic combination of various skills that increase the probability to (persistently) innovate. Social implications: With innovation persistence being especially relevant for long-run dynamics behind economic growth, the results of this study provide insights into potential public policies. Governments are in a position to at least lower barriers, which might enable more firms to persistently innovate. Continuous access – less than the actual amount – to financial resources aimed at innovation activities and learning through interaction with external agents is fundamental for both kinds of innovation persistence. Both are market characteristics where governments can – at least indirectly – intervene. Originality/value: Despite the existence of various theoretical approaches, the bulk of empirical research focuses on the verification of true state innovation persistence. Thus, while innovation persistency has been widely confirmed to exist to a certain degree, knowledge regarding which theoretical approach is likely to drive a firm to persistently innovation is still scarce. Additionally, this study is placed in the context of a developing country, which by most empirical research has been overlooked but is characterized by one element which is decisive for the empirical methodology: many firms do not innovate, let alone persistently innovate.

Sandford Borins addresses the enduring significance of innovation in government as practiced by public servants, analyzed by scholars, discussed by media, documented by awards, and experienced by the public. In The Persistence of Innovation in Government, he maps the changing landscape of American public sector innovation in the twenty-first century, largely by addressing three key questions:? Who innovates?? When, why, and how do they do it?? What are the persistent obstacles and the proven methods for overcoming them?Probing both the process and the content of innovation in the public secto

We empirically investigate whether the persistence of politicians in political institutions affects the innovation activity of firms. We use 12,000 firm-level observations from three waves of the Italian Observatory over Small and Medium Enterprises, and introduce a measure of political persistence defined as the average length of individual political careers in political institutions of Italian municipalities. Standard OLS shows no raw correlation between political persistence and firms' innovation activity. However, once the causal effect is isolated by means of instrumental variables, using death of politicians as an exogenous source of variation of political persistence, we find a robust negative relation between political persistence and the probability of process innovation. This finding is consistent with the view that political stability may hinder firms' incentive to innovate to maintain their competitiveness, as long as they can extract rents from long-term connections with politicians.

We empirically investigate whether the persistence of politicians in political institutions affects the innovation activity of firms. We use 12,000 firm-level observations from three waves of the Italian Observatory over Small and Medium Enterprises, and introduce a measure of political persistence defined as the average length of individual political careers in political institutions of Italian municipalities. Standard OLS shows no raw correlation between political persistence and firms' innovation activity. However, once the causal effect is isolated by means of instrumental variables, using death of politicians as an exogenous source of variation of political persistence, we find a robust negative relation between political persistence and the probability of process innovation. This finding is consistent with the view that political stability may hinder firms' incentive to innovate to maintain their competitiveness, as long as they can extract rents from long-term connections with politicians

Purpose
The purpose of this paper is to test the existence of true persistence in the generation and adoption of product innovations in the context of a developing country.


Design/methodology/approach
A dynamic probit model with random effects is used to test true persistence relying on a panel data set constructed from three waves of the Colombian innovation survey (Encuesta de Desarrollo e Innvovación Tecnológica) covering the time span from 2003 to 2008.


Findings
This paper empirically shows the existence of true innovation persistence for two of the three types of product innovation studied: the adoption of product innovation that is new to the firm; and the adoption of product innovation that is new to the national market. However, the study could not confirm true persistence in the generation of product innovation.


Originality/value
To the best of our knowledge, this is the first study that systematically tests innovation persistence differentiating between the adoption of innovations that are new to the firm and innovation that is new to the national market. It is also the first study in this research area that uses a dynamic probit model with random effects according to the original specification by Wooldridge (2005).