And to increase participation among broadcasters. That (whole) approach was certainly appropriate in that day and for a long time thereafter, I believe.And the legislative purpose of local radio as set up in the late 1920's and early 1930's in the U.S. was to prevent national radio in most forms by limiting station power and the number that could be owned. That was the goal of politicians who wanted radio to be limited in influence; they feared regional newspapers and did not want to see any radio owner have greater influence.
Advertisers can do the same thing here, maybe just need additional time buyers for the markets.And what makes radio more profitable and better programmed in other nations is the ability of advertisers to make just a few buys and cover the whole country with a few different formats.