Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Have other sources at hand if using this book.

Pro: Contains good graphs.Cons: Badly edited, if it was even edited to begin with. On the answer to question #3 of the Review Questions in pg. 32, it says the answer is E, claiming that when cross-elasticity of demand is positive, the goods are complements. If you look on pg. 28 where it explains Cross-Elasticity, it says "If in the previous equation we get a positive number, it is safe to assume that the two goods are substitutes." Ironically, I used the Cliffs Quick Review for Economics to sort this out.