Will the production of plastic waste reduce when the outlawing of thin plastics is replaced by thicker plastics? Your politician who benefits from passing feel-good legislation says yes. Reality might surprise you: "In particular, my results showed that bag bans caused sales of small (4 gallon), medium (8 gallon) and large (13 gallon) trash bags to increase by 120 percent, 64 percent and 6 percent respectively." http…
And the bottom line - "30 percent of the plastic eliminated by the ban was coming back in the form of trash bags". So, the policy was 70 percent successful. Why then all the hand-wringing?
Coase theorem shows that increasing transaction costs increases externality costs. https://en.wikipedia.org/wiki/Coase_theorem
If you ban the giving out of thin-plastic bags because they feel bad, and then the market moves towards giving everyone a thick (more environmentally taxing and ecologically costly) 'reusable' bag, you've made the environment worse not better (despite it feeling better). Case in point: the number of times a bag needs to be reused before it was less ecologically costly far exceeds the life of the bag.