I was wondering what the general convention/consensus is on this issue; in a regular tech deal (IE, one buyer, one seller, sending directly to each other) what is the status of the owed tech if the seller does not managed to accept the tech before it expires? Does the seller still owe the tech to the buyer just as before? Is the sellers part done since the tech has been offered and the buyer simply failed to accept it? What if the seller sends the tech a second time and it is again not accepted before expiring?
Since aid slots are more finite and thus more valuable than tech to nations with 100 tech or money to nations with lots of infra+ wonders it certainly could be argued that is the aid slot that is actually being purchased (or rented), and thus the seller has completed his part of the transaction as soon as the aid expires, regardless of whether it was accepted or not. If one follows this line of reasoning then it could be argued that if someone fails to accept money for a tech deal before it expires, then they still owe the tech as they used up one of the buyer's aid slots for 10 days.
TTK doesn't have any "official" position, but generally it seems that sellers in my alliance are expected to "try again" if the tech is not accepted the first time, I was wondering what positions other alliances had officially or unofficially to this situation.
Note that obviously if the seller is below 100 tech for most of the time the foreign aid is active then I think we'd all agree that it is the seller's fault, and thus he should send again.