Answer:
Potential total surplus to increase.
Explanation:
As we know that:
Producer Surplus = Market value - Minimum price to sell
This means that for Liam:
Market value at which he can sell the ticket was $18 and the minimum price was $15
By putting values, we have:
Liam's surplus = $18 - $15 = $3
Now
Consumer Surplus = Consumer willing to Pay - Consumer Paid
For Alexander, the amount he was willing to pay was $20 and what he actually paid was $18 if the regulation hasn't intervened.
Alexander's surplus = $20 - $18 = $2
This means that the regulation prevents the increase in the potential total surplus and this has increased the dead weight loss of $5.