As for economical in the "traditional" sense, maybe not. I don't know how much success they're (still/actually) having but if you want a little glimpse into what should be possible in easily digestible docu-film format, look up "The Biggest Little Farm" (it's on Netflix for example).

One thing I took away from that is that it's maybe not economical in a "have a one crop pigeon poop farm" (i.e. you sell pigeon poop from feeding pigeons), you can have a farm that sells a lot of things that uses a lot of different animals and crops in combination in order to not have to buy in things from the outside that "traditional" farms have to.