Regulations are made to make sure that businesses comply with the minimum safety and health rules, as well as not actively harming the consumer. So, no, no area benefits from deregulation. Giant companies love deregulation so they can monopolize and/or fix prices. Getting to your barber example: if I’m trying to find a barber, I will surely only look for licensed barbers, as I surely do not want a busted hair job, or to incur in any hazard. Simple as that.