Aluminium certainly, but glass is not clear cut. A quick web search leaves me thinking it depends, not just on whether you measure energy, greenhouse gases, or cost (versus cost of disposal if not recycled), but also all of those vary between countries.
Yes, economics of recycling plastic are very bad, I wonder how high the cost of landfill would need to increase to make it more expensive than recycling.
The economics only indicate the practicality of recycling. But the other component is environmental impact for the portion not recycled... not only is their immense economic friction for recycling of plastics, but there is also a high environmental cost.
Compared to other widely used materials that are essentially inert, the environmental cost of not recycling is mostly limited to the impact of sourcing virgin materials that could have been from recycled sources.
Yes, economics of recycling plastic are very bad, I wonder how high the cost of landfill would need to increase to make it more expensive than recycling.