<human>:  Why is the Toyota Mirai Fuel cell so expensive?
<bot>: The Mirai is the first mass-produced hydrogen fuel cell vehicle, and it is priced accordingly. The Mirai is also the first hydrogen fuel cell vehicle to be sold in the United States, and it is being sold at a premium price due to the fact that the technology is still new and not yet fully developed. The Mirai has a high cost of development because it is the first hydrogen fuel cell vehicle to be mass-produced.