46 4. 2 Assumptions and definitions 48 4. 3 Single period models 4. 3. 1 Introduction: the MM-position 48 4. 3. 2 The effect of risk of default and limited liability 50 53 4. 3. 3 The effect of bankruptcy costs 4. 3. 4 The effect of agency costs 58 4. 3. 5 The effect of informational differences 60 4. 4 Multi-period models 63 4. 4. 1 Introduction: additional assumptions and redefinitions 63 65 4. 4. 2 The MM-position 67 4. 4. 3 The effect of limited liability and the risk of default 4. 4. 4 The effect of bankruptcy costs 70 4. 4. 5 The Scott model 72 4. 4. 6 Some extensions of the Scott model 76 4. 5 Conclusions 79 Appendix to chapter 4 82 83 5 Determinants from the practice of small business finance 83 5. 1 Introduction and overview 5. 2 Determinants related to the firm's internal characteristics 85 5. 3 Determinants related to the firm's external relationships 91 6 A comparison and evaluation of both sources 94 6. 1 Comparison and evaluation 94 6. 2 Summary and empirical implications 98 PART III : EMPIRICAL ANALYSES IN SMALL BUSINESS 7 Analyses of samples of individual firms 103 7. 1 Introduction 103 7. 2 Data 104 7. 3 Hypotheses and variables 107 7. 4 Specification and estimation results 113 IV 8 Analyses of industry averages in retailing 131 8. 1 Introduction 131 8. 2 Data 132 8.