# Contents

|**Abbreviations and acronyms ......................................................................................................................................................... v**|
|---|
|**1 Data .............................................................................................................................................................................................. 2**|
|Agroecological zones .......................................................................................................................................................................................... 2|
|IFPRI SPAM ........................................................................................................................................................................................................ 2|
|Transport networks and travel times ................................................................................................................................................................... 3|
|Measures of local market size ............................................................................................................................................................................ 4|
|Roughness of terrain ........................................................................................................................................................................................... 4|
|Merging of data sets ............................................................................................................................................................................................ 5|
|**2 Descriptive statistics .................................................................................................................................................................. 5**|
|Crop production ................................................................................................................................................................................................... 5|
|Travel time, population, and agricultural production ........................................................................................................................................... 6|
|Estimated crop-surplus regions ........................................................................................................................................................................ 10|
|**3 Conceptual framework and model .......................................................................................................................................... 12**|
|Econometric issues ........................................................................................................................................................................................... 13|
|**4 Econometric estimates ............................................................................................................................................................. 14**|
|The impacts of road connectivity on crop production ....................................................................................................................................... 14|
|Road connectivity and adoption of high-input/high-yield technology: Sub-Saharan Africa total....................................................................... 16|
|Comparing East and West Africa ...................................................................................................................................................................... 18|
|**5 Interpretation of results and implications for spatial investment ........................................................................................ 24**|
|Implications of investment: corridors versus rural roads in Mozambique ......................................................................................................... 26|
|**6 Summary and policy implications ........................................................................................................................................... 30**|
|**References ..................................................................................................................................................................................... 32**|
|**Appendixes .................................................................................................................................................................................... 34**|

iv