How do we authors know if we've succeeded? Is it based on reaching a certain number of sales? Seeing our book on a bestsellers' list? Being adorned with copious five-star reviews? For many authors, these are precisely the measures they use to gauge their success. In capitalist societies, the accumulation of material wealth is the measure of success, and whether a book is a bestseller right then and there doesn't matter, so long as it's still generating revenue. Published works have a precarious half-life, subject to any number of factors, including, first and foremost, reading trends (currently popular genres, book sales in general), as well as the success of the author's latest published work, genre (literary fiction never dies), whether it's part of a series, and (the one factor we authors can control - I'll come back to this) the author's behaviour. But they do have a half-life, which means authors, potentially, earn some of their living from...