Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Waste of time

There is no useful information in this book. It is a huge plug for some software that anybody could make in an hour with Excel. The author is on a rave about the political system more than trying to explain a useful financial tactic. And why buy the book? The tactic is: use existing money to pay down your mortgage, then borrow back the same amount and buy investments. The interest on the re-borrowed portion is now deductible. Simple as that.