price stability in an oligopoly works by ensuring that barriers to entering the market are high. this is a good thing, because it prevents companies from getting into price wars, which in the end results in bankruptcy, and price hikes when demand can no longer meet supply because the companies have driven each other out of business through competition, and are now all in debt, from trying to survive the price war. consumers may see prices temporarily fall, but it's at a loss to the business and it's not sustainable - it leads to steep price hikes in the long run, as the victors need to charge their way out of debt.
the end result of government policies that encourage competition is that the oligopolies turn into monopolies, businesses consolidate, an area with five stores loses two or three, and supply has difficulty meeting demand, leading to steep price hikes. it's carnage.
that is why oligopolies develop, because the companies calculate that is in nobody's interest - including the interests of consumers - for the businesses to compete. rational consumers don't want the chaos that comes from stores constantly fighting with each other, they want stable and predictable outcomes that they can budget around. they want the price to rarely if ever change at all. that's where price setting creates a superior and preferable outcome to competition.
if what these government bureaucrats are trying to do in interfering in the free market is create chaos and instability and drive stores out of business, thereby reducing consumer choice and driving prices up, it should keep it up. if it's trying to reduce prices, allowing new businesses to enter the market by undercutting the established ones will not do that, it will just create debt and bankruptcy and higher prices in the long run.
again, this is what you learn at a school when you enroll in an economics course. it's very different than what they talk about when conservative political clubs go get a beer, which is a bunch of nonsense that they go out of their way to educate out of you when you actually show up at the school and actually take the course.
again, this government is making economics mistakes you don't expect liberals to make. this is a giant leap backwards into retardo harperology land.