How Do You Know What Marketing Is Working for You?

Most authors don't get access to anyid real time sales. Yer, the bottom line is, i don't know. I don't have that real time r o i. It's not even like i can ask my publishers to give me that real time data. So it's really frustrating. And so what i do is i think about my return, not in terms of sales, but in terms of growth. What everything which is why i don't advertise, for example. My return is is community building rather than booksales.