Disadvantages or free market arguments towards a national min wage

Increases firms' costs of production

would you follow up with the whole less money to become more efficient, thereby missing out potential for cheaper goods/services for consumers?

Yeah, limit to dynamic efficiency and ability to price discriminate

cheers, what do u mean by ability to price discriminate though?

So for a larger firm e.g. monopoly/high concentration ration, by imposing higher costs on them, they have reduced profit margins so they have to compromise on their ability to price discriminate i.e. charge different prices to different consumers for the same product.