It should be clear at this point that there has been no "other loss," so we won't make you go through that.

Now, what is "cost avoided" of the Non-Breaching Doofisious (i.e., any cost or other loss that he has avoided by not having to perform)? (The contract price was 9,000 drachmas. Odysseus paid Doofisius 2,000 drachmas. If the contract had been performed, it would have cost Doofisius 7,000 to perform. Three thousand drachmas were spent prior to breach.)