There's a field called mental accounting. Wikipedia, the free, on-line encyclopedia describes it this way:
The way a person subjectively frames a transaction in their mind will determine the utility they receive or expect. Acquisition value is the money that one is ready to part with for physically acquiring some good. Transaction value is the value one attaches to having a good deal. If the price that one is paying is equal to the mental reference price for the good, the transaction value is zero. If the price is lower than the reference price, the transaction utility is positive.What's this got to do with writing? Everything. When a reader considers buying a book, he or she looks how much hard money he or she is going to have to put down. But they also look at the value to them of getting something more than worth the money. You have to give them that if you them to buy your book. Sometimes we get so lost in story and character and exposition and narrative we forget why we are publishing.
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Writing for me is entrepreneurial. If you want to read my entrepreneurship course, go to www.hatman2.blogspot.com. For real estate to www.yourstopforrealestate.com/blog.