Introduction; 1. What is Human Capital?; 2. Testing for Human Capital as a Binding Constraint to Growth; 3. From Diagnostic Symptoms to the Syndrome and Therapeutics; Conclusion; Appendix 1: Mincer Regression for Mexico and Chiapas; Appendix 2: Incorporating Quality in Mincer Regression; Appendix 3: Wage Premia by Industry and Occupation; Appendix 4: Industry Factor-Intensity and Relationship to Country Exports.