“I’ve heard it all before.”

That comment applies to the music AND it can be attributed to some veteran salespeople after reacting to their first day of sales training.  No matter  what you read about selling, not much has changed in the last 40 years. Even my book, Baseline Selling, is based on concepts that go back as far as 1935.  Did I improve on those concepts?  Yes!  But Selling itself is not a new concept.