Market socialism can be distinguished from the concept of the mixed economy because most models of market socialism propose complete and self-regulating systems, unlike the mixed economy. While social democracy aims to achieve greater economic stability and equality through policy measures such as taxes, subsidies, and social welfare programs, market socialism aims to achieve similar goals through changing patterns of enterprise ownership and management.

I mind if you are simultaneously linking to a Wikipedia article defining it as being completely self regulated, lacking any form of social welfare.

Capitalism's problem is that, ultimately, it's "compete" or die because you need to work to afford to live. I'm not necessarily advocating for the nationalization of all industries or a command economy. There can be competition, but the playing field needs to be leveled first. Workers owning the enterprise as a collective is a step in the right direction but that still leaves the door open for "B2B" exploitation when an enterprise's failure can mean its workers now cannot afford to live.