Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 300% inflation

This product sold for around $20 in the fall of 2007. Now it is priced at $80? That is 300% inflation in less than one year! There is no way this CD is worth $80. The publisher is attempting to rip off students in a major way. I will not recommend this product for my class again until it returns to a fair price ($20).