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If the credits help things scale to the point of being self sustaining.
Remember, the alternative power vehicles mean potentially less use of oil, thus
driving that cost down for those not yet using those vehicles. This means the
big trucks and trains have lower costs to deliver the other goods, meaning they
can be sold for less and still be profitable.

But I do agree, there does need to be a set of rules that would cause them to
expire once the goal is reached, You can be sure it will happen since they need
the revenue to pay for the union workers.