> You just (unintentionally) said that capitalism is the problem.
That's a strawman fallacy [1].
> If people were willing to pay for antibiotic-free meat, then farmers would produce it.
Seeing as most farming in the United States is done on megafarms owned by large corporations [2] that have historically shown to be (to put it mildly) lax on their focus on serving healthy and nutritious products to their customers [3], and that "farmers" in the traditional colloquial sense are now only 2% of the population [4], you'll hopefully understand if I say that your statement has little relevance in the United States in 2013.
[1] https://yourlogicalfallacyis.com/strawman
[2] http://thecabin.net/stories/091001/wor_0910010048.shtml
[3] http://en.wikipedia.org/wiki/Smithfield_Foods#Environmental_...