Audio has been around since, I suppose, the spoken language. The difference now is distribution and availability. Audiobooks, podcasts, smart phones, voice controlled home speaker systems, connected cars, and who knows what will come next.
If you have a podcast, you have some, well, power, authority, credibility. Just like if you have a book, you instantly have some leverage...
Bradley Charbonneau is an “unstoppable writing machine.”
Don't know where to price your audiobooks? Here you go.