I wonder how the economics have changed between when this book was written (2014) and today? For reference, there are twice as many books published last year t

I wonder how the economics have changed between when this book was written (2014) and today? For reference, there are twice as many books published last year than in 2014. It's cumulative of course, you're competing for limited readers against every book written every year since the dawn of time (unless you're writing on a brand new subject).