There is no chance of genuine "anti-monopoly laws" in an economy where the bourgeoisie is in control of the large firms. Even if necessities are publicly owned, the proletariat and even lesser bourgeoisie lose out in influence over the state, lacking the political control to enact such laws that directly go against the most powerful in society. The only way is socialism, which requires that not just the necessities, but also the large firms be publicly owned, and the medium firms tightly controlled by the state.