4a. Trading away a tech costs 1 voucher. All players get 8 vouchers. Vouchers cannot be traded away for anything but techs. (this means that civs can give away 8 techs, receive 8 techs for their vouchers, trade 8 techs for 8 techs or a combination of these options.)
It's allowed to:
- give away a tech (the giver of the tech loses a voucher)
- trade a tech for a tech (both lose a voucher)
- trade a tech for a voucher (the receiver of the tech loses a voucher)
But vouchers cannot be traded away, unless for 1 tech.
So trading 2 vouchers for 1 tech is not allowed. Or 1 voucher for gold or for peace.
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