Banning plastic for unnecessary goods may rein in consumerism a bit. Consider cheap plastic toys. Without plastic, those toys would cost more, and people would buy fewer of them. I doubt the priciness would cause real harm poorer families, considering how manufacturing has lowered the price of even wooden toys so much. Plus so many stores sell used toys.

I'd only worry about the affect of a plastic restriction on food prices. But, again, it might be a blessing in disguise by steering people towards fresh produce and meat.