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California Senate approves ban on autonomous trucks
(driveteslacanada.ca)
This is a most excellent place for technology news and articles.
Cost is determined more by what people are willing to pay and less by what it costs to make the product.
If they can charge $5 for a bottle of water, they're going to do that whether it's costs $1 or $2 to make.
So if they could increase costs today, they would. An increased tax would give them a politically friendly exercuse to do so, but it's just an excuse. They'd do it either way.