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The effect of CEO gender on commitment

to innovation

by

EGBERT JAN GROOTENHUIS

University of Groningen

Faculty of Economics and Business

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Abstract

These days, firms devote a lot of time and money to find the 'right' CEO for their company. Based on the 'upper echelon theory' of Hambrick & Mason (1984) the managerial influence on organizational outcomes and strategic choices is thought to be very high. Facing the consequences of the economic crisis, businesses would simply appoint a female CEO since women are assumed to act more risk-averse. This study is highly relevant for policy makers and organizational theorist for our results show there's no difference between the commitment to innovation of companies with a female CEO and those with a male CEO. Moreover, tenure is the only CEO characteristics with a significant influence on the commitment to innovation. In capital intensive industries organizational size is of dire importance in elucidating organizational outcomes, e.g. the commitment to innovation.

Research theme

Organizational characteristics and innovative behavior and performance

First supervisor Dr. F. Noseleit

Second supervisor Dr. I. Estrada Vaquero

Keywords

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2 Table of contents

1. Introduction ... 3

2. Literature review ... 5

2.1 Top management characteristics and innovation ... 5

2.2 Leadership ... 7

2.3 Gender and risk ... 8

3. Methodology ... 11

3.1 Sample characteristics ... 11

3.2 Data collection ... 12

3.3 Dependent variable: Risk aversion ... 12

3.4 Independent variable: ... 13

3.5 Control variables ... 13

4. Analysis ... 14

4.1 Comparing the two groups ... 14

4.2 Distribution ... 15 4.3 Regression ... 16 5. Discussion ... 19 6. Conclusion ... 21 6.1 Conclusion ... 21 6.2 Implications ... 21

6.3 Limitations and possibilities for future research. ... 22

References ... 23

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1. Introduction

"During an economic crisis highly educated employees prefer their company to be led by a female CEO. They appreciate the sympathetic, compliant and non-authoritarian behavior that characterizes the feminine leadership approach. This stands in sharp contrast with the classic masculine leadership approach that is thought to be greedy, egocentric and focused on power." These sentences summarize the main empirical findings of Rink & Stoker's (2012) study on leadership in times of crisis. Whether or not caused by the crisis, fact is that more and more companies appoint a female CEO. Figure 1.1 shows the percentage of Fortune 500 companies with a female CEO (Catalyst, 2013). Furthermore there is the topic of creating more gender equality in the business environment. There is currently an intense debate going on about the intention of the European Commission to establish a quota for female top managers. At the moment we may therefore speak of CEO-gender as an interesting topic.

Figure 1.1 percentage of Fortune 500 companies with a female CEO Source: catalyst.org

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counterparts and that this is a good thing. While this might be true for some sectors, e.g. banking, other industries thrive at making (the right) risky decisions. The high-tech branch shows some illustrative examples: Google buys YouTube, Apple enters the phone market, and Microsoft decides to compete with Sony and Nintendo through the introduction of the XBOX (Businessinsider, 2012). In these industries 'playing safe' is often not the right strategy to survive. These companies need radical innovations to stay ahead of their competitors, and one characteristic of such an innovation is the high amount of risk it comprises (Kor, 2006). These insights provide a quite different perspective on the topic of female leadership. Although there is already a large body of literature on the role of gender diversity in top management teams (TMT) there is still little known about the effects of a female chief executive officer . Only very recently, Khan & Vieto (2013, still in press) studied the effects of a female CEO on company performance. Their results showed that firms managed by female CEOs performed better in comparison with the male led companies. In their article about gender diversity in top management teams Krishnan & Park (2005) properly summarize the current scientific work on female top managers. First, there are studies focused only on statistics (Burke & Mattis, 2000; Joy et al., 2007). Second, you'll find studies that are mainly interested in the compensation differences between male and female directors (Krishnan & Park, 2012; Bertrand & Hallock, 2001). Third, there have been studies directed at the leadership differences between male and female managers (Eagly & Johnson, 1990). Finally, the most recent studies focus on the performance differences between companies being led by a male director and those led by a female director (Krishnan & Park, 2005; Smith & Verner, 2006; Khan & Vieto, 2013). Generally speaking we assume that women take less risk than men do. This is also the reason why women get a discount on their car insurance, they drive more carefully (autoos.com, 2010).

In this study we investigate if there is a relationship between CEO gender and the relative amount of money invested in research and development (R&D). We expect a female CEO to be more risk averse and hence spend relatively less money on R&D. R&D intensity will be used as proxy for risk aversion.

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2. Literature review

Much of the recent academic work on female top managers focused on industries that promote stability. This study differentiates from the usual approach since it uses a sample consisting of manufacturing firms. Businesses in this sector need to take more risk in order to survive (Bromiley, 1991). The steep increase in Fortune 1000 companies with a female CEO provides an excellent opportunity to advance the earlier work on the link between top management characteristics and commitment to innovation. The first part of the literature review will discuss the current academic work directed at the various factors that impact the commitment to innovation. The second part is dedicated to work on gender differences, especially related to the topic of risk taking.

2.1 Top management characteristics and innovation

Innovation is important for the growth of the economy in general (Schumpeter, 1943), and is an important source of competitive advantage for the individual firm itself (Porter, 1998). Investing in research and development is therefore thought to be one of the most important decisions to be made by top management (Barker & Mueller, 2002). Investing in R&D can be seen as an innovation input, and is sometimes also called 'commitment to innovation'.

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or R&D background, and highly educated were more likely to have successful market innovation strategies. These studies are limited due to their focusing on one particular industry. They may therefore reflect industry idiosyncrasies while ignoring the broader patterns (Barker & Mueller, 2002).

Deallenbach et al. (1999) was one of the first to do a multi-industry analysis. They found a positive relation between technical work experience and R&D expenditures whereas education, company and industry experience showed no direct link with R&D expenditures. In addition, Barker & Mueller (2002) found that CEOs with career experience in marketing and R&D were positively related with R&D expenses as well as those with greater wealth in stock invested. Other results were a significant increase in R&D spending when CEOs had an advanced science degree, and the effect of tenure on R&D. Education, however, did not seem to be an issue once a CEO has gained a college degree.

Little attention is paid to the possible effects of gender differences in top management, especially in the context of innovative performance. This may be caused by the low percentage of women that had a top management position until recent times (Krishnan & Park, 2005). But times are changing, and at the moment we can witness a steady growth of women in higher management positions (Figure 1.1). Large multinational companies like IBM, Walmart, Yahoo, HP, Sara Lee and eBay are all being led by a female chief executive officer (Forbes, 2012). One common explanation for this increase is that a female CEO takes less risk than her male opponent (Palvia et al, 2011).

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7 2.2 Leadership

2.2.1 Implicit theories about leadership

Most people associate leadership with men. When thinking of a manager, the image of a somewhat older man immediately pops up. Scholars argue that this supposed relationship between men and leadership is caused by the implicit theories people have about leadership and gender (e.g. Heilman et al., 1989; Eagly & Karau, 2002; Agars, 2004). Male leadership is characterized by acting emotionally stable, aggressive, self-reliant, competitive, objective and ambitious (Ryan & Haslam, 2005) whereas female leadership is characterized by being helpful, understanding, sophisticated, intuitive and cheerful (Schein, 1973;1975). Schein also showed that both male and female respondents thought men possessed the right characteristics to be a successful manager. Replications of this study proved these results are still valid today (e.g, Brenner et al. 1989; Schein & Muller, 1992; Boyce & Herd, 2003). These implicit feelings about gender and leadership prevent females from taking managerial positions in two ways. First these implicit feelings reduce the perceived suitability for a women to fulfill management roles, by stating that 'a woman is not up to the task' (e.g. Heilman, 1983; Kent & Moss, 1994) Secondly, female managers receive greater criticism and are evaluated less favorable as men when showing the same behavior (Eagly et al, 1992). Thus, a male manager acting aggressive and competitive is displaying leadership, however, when a female manager is acting in this way her behavior is seen as unacceptable pushy (Ryan & Haslam, 2007). These implicit theories do, however, show some variation that is caused by the context in which the company operates (Ryan & Haslam (2007). Female managers are more accepted in "feminine" sectors like healthcare and retail than in "masculine" industries as manufacturing and mining (Blum et al., 1994; Singh & Vinnicombe, 2003 cited in Ryan & Haslam, 2007).

2.2.2 The rise of female CEOs

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sympathetic, compliant and non-authoritarian (Emrich, 1999; Ryan & Haslam, 2007, Rink & Stoker, 2012). Another explanation for the growing amount of female directors is the board policy of investors that only want to invest in companies with a diversified board of directors since this enhances the firm value (Carter, Simkins & Simpson, 2003). The third reason for the recent growth of female executives are the government regulations that require a minimum percentage of female top managers (Terjesen, Sealy and Sing, 2009). Additionally the literature proposes an explanation that has nothing to do with the environment or organization, but with the female managers themselves. Furst & Reeves (2008) state that "successful women leaders break many traditional stereotypes regarding “female” leadership traits and demonstrate a willingness to take risks and make decisions that defy conventional wisdom".

2.3 Gender and risk

2.3.1 What is risk?

In the decision making theory, risk relates to the variation of the possible outcome distribution and the likelihood of this outcome. This implies that a choice is considered risky when it has a wide range of possible outcomes (March & Shapira, 1987). In general people are thought to be risk averse decision makers, when choosing between two alternatives with the same expected outcome, an individual will prefer the alternative with the highest certainty to the less certain alternative (Pratt, 1964; Arrow, 1965; Ross, 1981). Therefore decision makers have to be compensated in order to consider the riskier alternative (March & Shapira, 1987). The decision making theory distinguishes between averse decision makers and risk-seeking decision makers. Risk-averse decision makers prefer a low risk and are willing to give up some expected returns in order to reduce the variation in the possible outcomes. Risk-seeking decision makers prefer a higher risk and are willing to give up some expected return as to increase the variation of the possible outcomes (March & Shapira, 1987).

2.3.2 Psychological research

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of a nuclear war, the dangers of radioactive waste, and the process of environmental degradation (Flynn et al., 1994). In general we thus find that that women are more risk-averse than men. Byrnes et al. (1999) notice that this relation seems to be stronger when it concerns intellectual risks.

The common explanation for the recurring differences in risk taking between men and women is that these differences originate from evolutionary aspects related to reproductive success. Eckel & Grossman (2002) write that: for a female, the low-risk investment in parenting effort yields the highest returns, whereas for a male, the higher-risk investment in mating effort produces a higher expected payoff (Daly & Wilson, 1988; Geary, 1998; Low 2000). A proper summary of psychology literature concerning gender differences in risk taking behavior is that "men took more risks even when it was clear that it was a bad idea to take a risk. The opposite was true for women, they seemed to be disinclined to take a risk even when it was clear that taking the risk was a good idea. Men thus encounter more failure compared to women. Women do, however, experience less success than they should". (Byrnes et al., 1999, p.378 )

2.3.3 Economical research

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2.3.4 R&D and risk

R&D expenditures are usually classified as risky investment when compared with expenditures on equipment and property (Bhagat and Welch, 1995; Kothari et al., 2002). This relatively high amount of risk could be explained by the long-term orientation of R&D projects (Barker and Mueller, 2002) and because R&D expenses are seen as irreversible (Kothari et al. 2002). Furthermore, R&D projects are characterized by uncertainties in achieving their technical goals, commercialization and appropriation, causing a high uncertainty of future returns (Mansfield, 1969; Scherer and Ross, 1990).

The psychological and economic literature indicates that women are more risk-averse than men. This finding combined with the notion that R&D expenditures are seen as risky decisions presumes a female CEO to approach R&D investments differently compared with a male CEO. Most studies use R&D intensity, measured as R&D expenses divided by net sales revenue, as a proxy for risk aversion (Hoskisson et al., 1993; Daellenbach et al., 1999). We therefore hypothesize that:

Ceteris paribus, firms with a female CEO will exhibit a lower R&D intensity as compared to firms with a male CEO.

This research attempts to extend the existing literature concerning the influence of CEO characteristics on R&D spending. The main question will be to examine the role of gender effects on commitment to innovation.

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3. Methodology

3.1 Sample characteristics

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Female CEO Male CEO

Name SIC-Code Innovation

Ratio Name SIC-Code Innovation Ratio HP 357 2.82% Apple 357 2.16%

Archer Daniels 204 0.06% Philip Morris 211 1.32% Mondelez Int. 202 1.32% Tyson Foods 201 0.13%

DuPont 282 5.90% Dow Chemical 282 3.01%

General Dynamics 381 1.72% Honeywell Int. 382 4.90% PepsiCo 208 0.84% Dr. Pepper Snapple Gr. 208 0.25% Xerox Corporation 386 2.43% Emerson Electronic 382 2.24% Avon Products 284 0.70% Ecolab Inc. 284 1.55% Campbell Soup 203 1.62% Hormel Foods 201 0.36% Ingredion Inc. 204 0.54% Ralcorp Holdings 203 0.43%

Mylan 283 6.52% Actavis 283 8.50%

Xylem 356 2.80% Pall Corp. 356 3.10%

Oil States Int. 353 2.22% Lennox Int. 358 1.72% Salix Pharmaceuticals 283 16.72% Cubist Pharmaceuticals 283 29.98% Axcelis Technologies 367 19.86% Monolithic Power Syst. 367 22.82%

ITT 356 2.81% Brocade Comm. 357 16.23%

Int. Game Technology 399 10.12% Hasbro Inc. 394 4.50%

Average 4.65% 6.07%

Table 3.1: companies compared by SIC-codes

3.2 Data collection

The databases of COMPUSTAT and Bureau van Dijk were used to gather the data on company sales, research and development expenses, number of employees and industry classifications. Because these databases contained only little information about the CEOs, the various company websites were used to collect more detailed information on this topic. Since quite a few female CEOs were appointed in 2011, this study only used the company records of the year 2012.

3.3 Dependent variable: Risk aversion

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13 3.4 Independent variable:

CEO gender is the key variable in this study. It is used as a dummy variable, a female CEO gets the value '0' and a male CEO gets the value '1' assigned.

3.5 Control variables

Based on the existing strategic management literature (e.g. Daellenbach et al., 1999; Barker & Mueller, 2002) we use the subsequent variables to control for factors that are known to influence the innovation ratio of a company.

First there are the company characteristics, size and type of industry in which the business is active. Company size is sometimes measured in terms of total revenue, other studies use the number of employees to describe the size. In this study we use both variables, the size is determined by multiplying the number of employees with the total revenue. Initially we expect an negative relation between size and innovation ratio, to check whether this relation stays negative we also use the squared term of firm size. A log transformation measure for firm size was used since this shows a stronger association with innovation (e.g. Damanpour, 1992).

The other organizational control variable is the industry classification in which a company operates. We distinguish between low-tech and high-tech industries. Using the SIC-code classification we can differentiate between the traditional manufacturing companies and those who make use of more advanced production processes. For statistical reasons the low-tech companies get the value '0' assigned, and the high-tech '1'.

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4. Analysis

4.1 Comparing the two groups

Before testing our hypothesis that women are more risk-averse than men, and therefore spent less money on R&D, we need to make sure that the two groups of companies are comparable. We need to minimize differences of anything other than CEO gender. From the literature (e.g. Rothwell, 1984; Baysinger & Hoskisson, 1989) it is clear firm size has a significant influence on R&D expenses, therefore we want to make sure the two groups are almost homogenous. This is measured by looking at the amount of sales which is often used in the literature as proxy for firm size (e.g. Elston & Goldberg, 2003; Aggarwal & Samwick, 2003) and also the number of employees.

Table 4.1: Descriptive statistics (N is for both groups 17, data of year 2012)

Variables Mean Std. Deviation Sigma (2-tailed)

Company characteristics

Sales (mln) Female CEO 26.153 34.772 0,798 Male CEO 22.918 38.106 0,798 Employees (th.) Female CEO 71.519 97.747 0,297 Male CEO 43.429 47.285 0,297

CEO characteristics

CEO Age (years) Female CEO 55,41 4,976 0,750 Male CEO 54,88 5,608 0,750 CEO Tenure (days) Female CEO 1046 940 0,088

Male CEO 1780 1440 0,088

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15 4.2 Distribution

Figure 4.1 uses a boxplot to analyze the innovation ratio of the selected companies, it distinguishes between the companies with a female CEO and those with a male CEO. At first sight it seems there are little differences between the two groups. The median innovation ratio of the female led companies is with 2,43% slightly higher than the median 2,24% of the male led companies. The only outstanding difference is that the third quartile for female led companies is higher (6,2%) than those of the male led companies (4,9%). This implies, before even making a regression analysis, that the differences between the two groups are minimal. In figure 3.1 we have seen that the average innovation ratio of male led firms is somewhat higher than that of female led firms, respectively 6.07% and 4.65%. This is mainly caused by a few outliers, e.g. Cubist Pharmaceuticals. These outliers are not shown in figure 4.1.

Figure 4.1

Boxplot comparing innovation ratio between firms with female CEO and male CEO

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not significant, we notice the mean innovation ratio of younger CEOs is twice the size of the innovation ratio of the older CEOs.

4.3 Regression

A SPSS diagnostics check suggested collinearity between the company characteristics 'high-tech/low-tech', 'LN-size' and 'Squared LN-size'. In case of multi-collinearity, the literature (e.g. Barker & Mueller, 2002) recommends to use separate regression models. We will therefore run a separate ordinary least regression (OLS) analysis to investigate the effects 'high-tech/low-tech' and organizational size on commitment to innovation. Figure 4.2 summarizes the results of various tests. Since we had to test 'High-tech/low-tech' separate from each other, we have two control models and also two full models. Model 1 acts as basis model because it includes the control variables with the exception of the 'high-tech/low-tech' variable.. Model 2, in addition, includes the variable 'CEO gender' and is therefore seen as our full model. Model 3 also acts as base model, with the difference that the variables for measuring organizational size are replaced by the variable 'high-tech/low-tech'. Model 4 complements model 3 since it introduces the variable 'CEO gender'. The explanatory power with only the control variables is substantial. In addition, models that include the measures for organizational explain more of the variance in R&D intensity compared with models that contain the variable 'high-tech/low-tech'. In model 1 we find the variables LN-size, the squared term of LN-size and LN-tenure to be of significant importance. We observe a negative relation between innovation ratio and size, indicating that larger companies have a lower innovation ratio. The squared term of LN-size is positive, meaning that although initially negative, the relation between size and innovation ratio will eventually become positive for very large firms. LN-tenure also turned out to be of significance, there is a positive relation indicating that tenure positively influences the innovation ratio of a firm. Although not significant, CEO age showed to have a negative effect on the innovation ratio. Control model nr. 2 also found a significant positive influence of LN-tenure, while CEO age showed an insignificant positive relation. Furthermore, high-tech firms showed a significant higher innovation ratio, although not as significant as organizational size in model 1.

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positive effect on R&D intensity. Model 4, just like model 2, shows that LN-tenure has a positive influence and is also significant. CEO age seems to cause a higher R&D intensity, although not significant. High-tech firms have a significant higher R&D intensity. CEO gender has a somewhat negative influence on the innovation ratio, indicating that the commitment to innovation is a little higher for companies with a female CEO. This result is, however, far from significant. Somewhat remarkable is that models with the control measure for organizational size included show that companies with an older CEO seem to have a lower innovation ratio, while models that include the variable 'high-tech/low-tech' illustrate a positive effect of CEO age.

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18 Figure 4.2

Results of regression analysis (OLS) with as dependent variable: innovation ratio (N=34)

Model 1: Control Model 2: Control Model 3: Full model Model 4: Full model Organizational size (LN) Beta -3.564*** -3.563***

B -7.797 -7.793 Std. error 1.439 1.463 Organizational size (LN) Squared term Beta 2.896*** 2.895*** B 0.177 0.177 Std. error 0.040 0.041

CEO tenure (LN) Beta 0.180* 0.452** 10.189* 0.466**

B 1.233 3.091 1.289 3.186

Std. error 0.645 0.950 0.688 1.015

CEO age (LN) Beta -0.061 0.067 -0.063 0.007

B -5.028 0.793 -5.187 0.540

Std. error 7.508 11.834 7.653 12.048

Low Tech / High Tech Beta 0.514*** 0.514***

B 7.728 7.734

Std. error 2.151 2.185

CEO Gender Beta -0.026 -0.044

B -0.375 -0.634

Std. error 1.382 2.127

R2 0.766 0.427 0.767 0.428

Adjusted R2 0.734 0.369 0.726 0.350

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19 5. Discussion

The various regression models presented in figure 4.2 disclose some interesting outcomes. The most remarkable result is that there is no linkage found between gender and commitment to innovation. None of the models showed a significant influence of 'CEO gender'. A possible explanation for the trivial impact of CEO gender might be that the differences in risk-taking between men and women decreases as they get older (Byrnes et al., 1999). Since most executives are seasoned managers, the differences between a male and female might be larger in lower-level management where the average age lies lower.

The only CEO characteristic that significantly influenced commitment to innovation is 'CEO tenure', indicating that a CEO with longer tenure will exhibit more commitment to innovation. Strategic management literature suggest an inverted U-shaped relation between tenure and risk taking. On one hand it is believed that a higher tenure leads a CEO to take more risks since past experiences gathered in handling risks will lead to a lower perceived uncertainty considering these risks (Simsek, 2007). On the other hand, a high tenure may cause CEOs to commit to the status quo and fail to adapt to changing paradigms (Cyert and March, 1963). The positive influence of CEO tenure in our sample might be explained by the fact that the average CEO in our sample has served for only 3.5 years. The negative influence of CEO tenure on risk taking seems to take place when a CEO is in place for at least 10 years (e.g. Eitzen & Yetman, 1972; Hambrick & Fukutomi, 1991).

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All firm characteristics play a significant role in explaining commitment to innovation. Organizational size and the fact whether a company could be classified as high-tech or as low-tech are strongly related. Organization size seems, however, to be the most important characteristic for explaining commitment to innovation. The relationship is negative, indicating that the larger an organization becomes the smaller the innovation ratio gets. We thus find that smaller companies spend relatively more money on R&D compared to larger businesses, which is a normal result since the innovation literature states that the R&D intensity and productivity for small firms is likely to be very high because of the relatively small workforce and low amount of capital invested (Globerman, 1975; Rothwell, 1978; Nooteboom, 1994). The squared term of organization size, on the other hand is positive, implying that the initial negative relationship between size and commitment to innovation turns positive at a given moment. Very large firms thus experience a positive relation between size and commitment to innovation. This result is conform literature findings that large firms are relatively more innovative in capital intensive industries (e.g. Damanpour, 1992; Audretsch et al., 1994; Shefer & Frenke, 2003). Furthermore, we find that high-tech companies have a significant higher commitment to innovation than low-tech companies, which is logical since R&D intensity is one of the main criteria used for distinguishing between the two groups (Von Tuzelman & Acha, 2005; OECD, 2011).

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6. Conclusion

6.1 Conclusion

These days, many firms devote a substantial amount of time and money to find the 'right' CEO for their company. Based on the 'upper echelon theory' of Hambrick & Mason (1984) the managerial influence on organizational outcomes and strategic choices is thought to be very high. In the wake of the economic crisis many companies appoint a female CEO in order to lower organizational risk taking. On the opposite, when more risk taking is needed companies would benefit from appointing a male CEO. We did not find evidence to support the hypothesis that a female CEOs is more risk averse compared with a male CEO. Furthermore, our results give reason to believe that the impact of a CEO on organizational outcomes might be overestimated. Especially in capital intensive industries organizational characteristics seemed of greater importance for elucidating organizational outcomes than CEO characteristics.

6.2 Implications

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22 6.3 Limitations and possibilities for future research.

The main limitations of this study are data related. Only data from the year 2012 could be used because many female CEOs were appointed in 2011. Most studies use data from multiple years to avoid any discrepancies that might happen in one specific year. Furthermore, the sample size was quite small with only 34 companies included. If the increase of female CEOs in Fortune 1000 businesses will continue, future studies may be able to select a larger sample. Although related with the sample size, the currently used sample was forced to compare firms operating in a sometimes slightly different industry. Ideally we would compare two firms that have both the same 3-digit SIC code, the only difference being that one CEO is male while the other is female. Further research should therefore include a larger sample of female CEOs.

In order to generalize the conclusion for other organizational outcomes it is desirable to select an industry in which commitment to innovation is of vital importance. E.g. the biotech or pharmaceutical industry.

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Appendix

Figure 1

Sizes high-tech and low-tech

Industry classification N Mean Std. Deviation Sigma (2-tailed)

Low-tech 12 2731631104,33 5106087678,290 0.845 High-tech 22 3267476485,55 8619754203,916 0.845

* p<0.05 **p<0.01 ***p<0.001

Figure 2

Innovation ratio: high-tech vs. low-tech

Industry classification N Mean Std. Deviation Sigma (2-tailed)

Low-tech 12 0.7612% 0.56043% 0,05*

High-tech 22 7.8680% 8.04888% 0,05*

* p<0.05 **p<0.01 ***p<0.001

Figure 3

Innovation ratio: young CEO vs. older CEO

CEO Age N Mean Std. Deviation Sigma (2-tailed)

≤ 55 17 7,3619% 9,10020% 0,111

> 56 17 3,3575% 4,29227% 0,111

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