The lowest level of permission occurs when a customer initiates contact due to an immediate, temporary need. For example, a consumer enters a retail store and asks an associate for help finding a laptop. Once the transaction ends, the permission generally expires unless the marketer successfully transitions the customer to a higher tier. Why You Should Read the Book
While written over two decades ago, Godin's philosophy forms the bedrock of modern digital business models.
There is no official, legal, free PDF of Permission Marketing floating around. The book is still under copyright.