Instructions: Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
Input: As a student and teacher of economics, this book has proved to be an invaluable resource! The lesson is simple and direct, yet one that many people fail to apply. This should be required reqding for anyone involved in the development of economic policy (or any other arm of policy making, for that matter). Whether you agree with Hazlitt's conclusions about how the market works or not, you cannot dispute the key lesson of this book. It is entertaining to read, particularly easy for a book about economics. I highly recommend it!
Output:
Positive