In 3.1, rejecting (R) fraudulent (F) goods resulting in 0 for the seller is a strong assumption. There are all kinds of possible negatives (typically risks of legal fees) for storage costs of fraudulent goods in the game of hot potato. It might be worth your time to look into the literature a bit more.
This is now my favorite way to visualize these concepts in practice.
- Who wants to drive across town to inspect a €50 item for a small fee (we can draw comparison to Uber Eats like platforms fees economies)?
- Can a random broker validate a luxury watch? Do we need another blockchain tech for broker validator skill reputation?
- Physical validation adds days to trades, in online economy, the faster the merrier
- Fees might price out low-value items
Let's see how this plays out.