Final answer:
Dominic and Soraya are likely to continue engaging in a mutually-agreeable trade despite the tax.
Step-by-step explanation:
In this scenario, Dominic's willingness to plow Soraya's driveway for $85 is lower than his opportunity cost of plowing her driveway, which is $55. This means that he is losing $55 by choosing to plow her driveway instead of engaging in an alternative activity. Additionally, Soraya's willingness to pay Dominic $100 to plow her driveway indicates that she values his service more than what Dominic values his time. However, the inclusion of a $15 tax each time Dominic plows a driveway changes the situation.with the tax, Dominic's net earning from plowing Soraya's driveway would only be $70 ($85 - $15). This is still higher than his opportunity cost, so he would still be willing to plow her driveway. On the other hand, Soraya's willingness to pay remains at $100, which is still higher than Dominic's net earnings. Therefore, both Dominic and Soraya are likely to continue engaging in a mutually-agreeable trade.
The correct answer is a) Dominic and Soraya still engage in a mutually-agreeable trade.