about the economics of apps

I'm not sure if this is the right place to ask, but if not- maybe someone will hint me to a better place :-)In a nutshell, there are 2 ways to make money from appsSelling itAdvertisementIs there any statistics/ knowhow which is a better/ more efficient way?other ideas about the economics of apps development?thanks via /r/business https://ift.tt/2KlUwvO