Textbooks cost hundreds of dollars. It’s not uncommon for engineering and healthcare-related books to come in just below $1,000. But with the high cost of textbooks comes opportunity. Flipping them for profit. By using a service like BookScouter, you can instantly compare book prices across 44 different vendors. You pick the one that offers the best price and voila. Book sold.
Regardless if you need to earn some fast cash or we're just talking about making money in the grand scheme of things, there's an important psychology that needs to be mentioned before getting into the strategies. If you study Freud's model of the mind, you'll discover the Psychic Apparatus. It's the three-part construct in your mind that controls all of your behavior.