Nigeria cocoa industry has suffered some setback as result of unfavorable investment climate that deters prospective private investors.Effects of private investment on cocoa output in Nigeria is a book packaged in a relatively simple and comprehensive manner aimed at using Vector Error Correction Model (VECM), a system dynamic approach to explicitly explain the short run and long run implications of private investment on cocoa sub-sector output. This book will be of great benefit to both under graduate and post graduate students of economics in the course of their research. The government and policy makers will also find this scholarly work as an indispensable asset for the formulation of programmes and policies that will promote and regulate private investment on cocoa production in Nigeria.