The list of qualifications above suggests the problems of this approach. As noted in point 3 above, consumers of pollution are generally consumers of a public evil that is not competitive in consumption; What we get, everyone. In this case, negotiations between wastewater recipients will not result in an effective distribution among recipients: some will want lower levels of pollution than others and will be willing to pay, but the fact that pollution is not competitive will prevent this result. When a recipient pays a polluter for an additional discount, all beneficiaries benefit in the same way. This non-competition in consumption explains why free trade in a public bath will not reach the social optimum. In 23 countries, the regulatory framework provided for a review of PRT prices. In Denmark and Ireland, revisions have also taken place at regular intervals, but they are based on a voluntary agreement between public payers and the pharmaceutical industry instead of legislation. Countries with revision or monitoring legislation had either fixed dates or fixed intervals between one month and five years. Of the 26 countries that followed prices and corrected prices, 18 did this exercise regularly, with the remainder on some occasions. The duration of the intervals ranged from 3 months to 5 years.
In some cases, regular price controls or revisions are linked to certain medicines: in Norway, the prices of 250 substances representing about three quarters of the value market have been revised each year and, in Spain and Ireland, prices of non-patented medicines have been regularly updated once a year. Five countries (Belgium, Croatia, Denmark, Germany and Hungary) indicated that they did not have regular intervals for price changes. The competent authorities of two countries (Germany and Hungary) have not reviewed and monitored drug prices at all. Despite the existence of the law in Hungary, the details regulation has not yet been implemented at the time of the investigation. Many English-speaking Commonwealth of Nations countries that have structured their training in a neoliberal market, such as New Zealand, Scotland, Australia, South Africa, England and Ireland, have adopted national certification frameworks.