instruction:
Given a review text from amazon and its polarity (either positive or negative). Generate answer "True" if given sentence and its polarity match, otherwise generate answer "False". A review is considered positive if the reviewer is satisfied with the product. Otherwise, it is considered negative.
question:
Review: It all depends on your purpose for these safety pins. I needed them for holding Velcro in place as the Velcro was pulling apart too easily. These safety pins bent as I tried to stab them into the material. The point is sharp, but the surface is rough. This rough point causes the material to cling to the safety pin rather than allow the pin to pass through easily.I would recommend the Dritz Quilter's Safety Pins. They are Nickel plated which makes them smooth and rust resistant. 
 Polarity: Positive
answer:
False


question:
Review: I'm sure you can see by now with everyone else's reviews that this product is garbage. Well, hey, if you pay close to nothing, don't expect anything much in return! Just save yourself the money and DO NOT BUY THIS PRODUCT... instead, put some gas in your car or something! 
 Polarity: Negative
answer:
True


question:
Review: This book is useful for teaching lower division undergraduate students the principles of microeconomics.It can be used as a supplementary book.Hazlitt emphasizes the important concept of opportunity cost,but neglects to incorporate any discussion of spillover effects and externalities(positive and negative,depletable and undepletable),market failure,public goods,the theory of second best,adverse selection,moral hazard, the principal-agent problem,etc.It is interesting that all these missing topics were originally covered by Adam Smith in The Wealth of Nations(1776),especially in Part V. 
 Polarity: Negative
answer:

False