Free Market Society
I do not think there should be a floor or ceiling to make it Islamic. Just honesty. If someone uses market manipulation, fake news or hoarding to get an edge to maximize profits, then that need to be stopped…not a ceiling on honest prophits. Also should be stopped is to take unfair advantage of the market and exorbitant profiteering due to situations like shortage of food, natural disasters, etc. This is no different than hoarding and against Islamic principals.