| Foreword | 5 |
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| Acknowledgements | 6 |
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| Contents | 8 |
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| Abbreviations | 12 |
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| List of Figures | 14 |
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| List of Tables | 16 |
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| 1 Introduction | 18 |
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| 1.1 Research Motivation | 19 |
| 1.1.1 Practical Relevance | 19 |
| 1.1.2 Theoretical Relevance | 20 |
| 1.2 Research Objective | 22 |
| 1.2.1 Diversification and Performance | 22 |
| 1.2.2 Managing Diversified Portfolios | 23 |
| 1.3 Structure of Dissertation | 24 |
| 2 Diversification in Corporations | 26 |
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| 2.1 Definition of Diversification | 26 |
| 2.1.1 Diversification as Process | 27 |
| 2.1.2 Diversification as Status | 27 |
| 2.2 Overview of Academic Research on Corporate Diversification | 28 |
| 2.2.1 General Overview of Academic Research | 29 |
| 2.2.2 Motives for Diversification | 31 |
| 2.2.3 Entry into New Businesses | 36 |
| 2.2.4 Structure of Multi-Business Firms | 39 |
| 2.2.5 Management of Multi-Business Firms | 41 |
| 2.2.6 Financial Implications of Diversification | 44 |
| 2.3 Diversification and Performance | 45 |
| 2.3.1 Measures of Diversification | 46 |
| 2.3.2 Influence of Diversification on Valuation | 49 |
| 2.3.3 Influence of Diversification on Financial Performance | 52 |
| 2.4 Managing Diversified Portfolios | 55 |
| 2.4.1 Value of the Parent Company | 56 |
| 2.4.2 Governance Model in Multi-Business Firms | 58 |
| 2.4.3 Availability of Central Functions and Resources | 62 |
| 2.4.4 Leverage of Resources and Competences across Businesses | 64 |
| 2.4.5 Portfolio Management in Multi-Business Firms | 66 |
| 3 Introduction to the Private Equity Industry and the Role of Diversification | 70 |
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| 3.1 Overview of the Private Equity Industry | 70 |
| 3.1.1 Definition of Private Equity | 71 |
| 3.1.2 Development of the Industry | 72 |
| 3.1.3 Structure of the Industry | 76 |
| 3.2 Profile of the Leveraged Buyout Segment | 82 |
| 3.2.1 Key Characteristics of Leveraged Buyouts | 82 |
| 3.2.2 Leveraged Buyout Landscape | 88 |
| 3.2.3 Value Creation Techniques | 89 |
| 3.2.4 Performance of Leveraged Buyout Investments | 97 |
| 3.2.5 Industry Trends and Future | 101 |
| 3.3 Diversification in Private Equity | 103 |
| 3.3.1 Diversification and Performance | 104 |
| 3.3.2 Managing Diversified Portfolios | 105 |
| 3.4 Comparison of Private Equity Firms and Diversified Corporations | 108 |
| 3.4.1 Acquisition and Diversification Strategy | 109 |
| 3.4.2 Portfolio and Divestiture Strategy | 109 |
| 3.4.3 Role of the Parent | 110 |
| 3.4.4 Role of the Operating Unit | 111 |
| 4 General Research Design | 113 |
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| 4.1 Starting Position in Academic Literature: a Synthesis | 113 |
| 4.1.1 Diversification Research in Corporations | 114 |
| 4.1.2 Diversification Research in Private Equity | 115 |
| 4.2 Direction of Research | 116 |
| 4.2.1 Research Direction “Diversification and Performance” | 116 |
| 4.2.2 Research Direction “Managing Diversified Portfolios” | 117 |
| 4.3 Empirical Research Design | 119 |
| 4.3.1 Research Design “Diversification and Performance” | 119 |
| 4.3.2 Research Design “Managing Diversified Portfolios” | 122 |
| 5 Empirical Part I: Diversification and Performance | 127 |
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| 5.1 Hypotheses | 127 |
| 5.1.1 Performance: Private Equity vs. Public Corporations | 128 |
| 5.1.2 Diversification and Performance in Private Equity | 129 |
| 5.1.3 Diversification and Performance: Private Equity vs. Public Corporations | 130 |
| 5.2 Methodology | 131 |
| 5.2.1 Data Sample | 131 |
| 5.2.2 Diversification Measures | 138 |
| 5.2.3 Performance Measures | 142 |
| 5.3 Empirical Results | 145 |
| 5.3.1 Performance: Private Equity vs. Public Corporations | 146 |
| 5.3.2 Diversification and Performance in Private Equity | 151 |
| 5.3.3 Diversification and Performance: Private Equity vs. Public Corporations | 167 |
| 5.4 Discussion of Results | 178 |
| 5.4.1 Diversification in Private Equity | 179 |
| 5.4.2 Performance Drivers in Private Equity | 181 |
| 5.4.3 Comparison Private Equity vs. Public Equity | 186 |
| 5.4.4 Limitations of Research | 188 |
| 6 Empirical Part II: Managing Diversified Portfolios | 190 |
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| 6.1 Exploratory Framework | 191 |
| 6.1.1 General Structure | 191 |
| 6.1.2 Influencing Factors | 192 |
| 6.1.3 Firm Conduct | 194 |
| 6.1.4 Private Equity Performance | 196 |
| 6.1.5 Feedback Mechanisms | 196 |
| 6.2 Methodology | 197 |
| 6.2.1 Sample for Exploratory Research | 197 |
| 6.2.2 Sources of Information | 200 |
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