Hm, prices are a wobbly thing... I don't trust these too much anymore these days. In practice, I'd think that metal is the thing easier to produce. You just need to heat something up warm enough, that's literally "all" that there is to do. Ways to generate high temperature I would think you can find a couple, while getting differing hydrocarbon compounds to link each other is a more difficult thing to achieve.
Another thing you can do with plastics, of course, is producing such that last for a longer amount of time. You know, not producing lots of these use&throw-away items... I know there's a huge difference between household items made of plastic made in GDR compared to such from Western production these days. GDR buckets made of plastic - or a laundry tub to transport washed clothes -, they can make it to turn 30 and 40 years old without showing those signs of becoming porous from too much sunlight. And the plastic is thick!
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In practice, I'd think that metal is the thing easier to produce.
You just need to heat something up warm enough, that's literally "all" that there is to do. Ways to generate high temperature I would think you can find a couple, while getting differing hydrocarbon compounds to link each other is a more difficult thing to achieve.
Another thing you can do with plastics, of course, is producing such that last for a longer amount of time. You know, not producing lots of these use&throw-away items...
I know there's a huge difference between household items made of plastic made in GDR compared to such from Western production these days.
GDR buckets made of plastic - or a laundry tub to transport washed clothes -, they can make it to turn 30 and 40 years old without showing those signs of becoming porous from too much sunlight. And the plastic is thick!