This book is excellent! Author, Richard J. Maybury, presents economics in a fun and engaging way. Each chapter comes with a set of questions to check comprehension and understanding of the material in general. However, answering these questions requires paper and a pencil.
My son MUCH prefers typing over handwriting. So, for the resources found here, all I did was type up the questions into Word documents so he could type out his responses instead.
The Answer Key is located in the book, A Bluestocking Guide: Economics, by Jane A. Williams.
Homeschooling Resources 