"Influence: The Psychology of Persuasion" by Robert Cialdini
Pretty much a must-read for anyone interested in sales, marketing, or "persuasion". However, even if you're not in that line of work it will blow you away. Lots of good examples and not a lot of fluff (despite what you might think just based on the title).
Google's keyword planner tool can be used to quickly gather the following useful data:
-Relevant keywords for your product or niche
-Market size (using Google search volume as a rough estimate)
-Market share (how many clicks you'll actually get using adwords)
All useful stuff for validating a product or business idea BEFORE launching. This is also known as a "bottom-up" market size analysis.
Pretty much a must-read for anyone interested in sales, marketing, or "persuasion". However, even if you're not in that line of work it will blow you away. Lots of good examples and not a lot of fluff (despite what you might think just based on the title).