No printing concern, institution, or other agency maintaining a printing plant or department for the purpose of instruction or the teaching of the art of printing, or allied arts, and whose purpose is to teach or instruct its students or members, shall produce, print, or cause to be printed any material whatsoever that may be placed on the market in competition with regularly established printing plants or concerns, if such printing concern, institution, or other agency is supported or operated from public or state funds or is tax free in any manner.