Answer and Explanation:
As per the data given in the question,
For Situation 1 :
a) Since US products will not have duty, Consumer will purchase from US>
b) If there is NAFTA, now the tax on China is higher at $5 which make them inappropriate, therefore consumer would like to purchase from Mexico at $6.
c) As country would be misleadingly separating against different items which will cause to increase wastefulness, So US consumers and the country as a whole is not happy with NAFTA.
For Situation 2 :
d) Consumers would like to purchase from China even with $3 duty cost is less, and total cost with tax is $7.
e) Consumer will purchase form Mexico as there is no levy and they can supply for $6.
f) Free trade agreements are critical to guarantee that exchange takes place absent a lot of taxes, it is necessary to advance directly commerce with NAFTA area for fate of US, Mexico would purchase measures of merchandise from US therefore this agreement should be invited for sure.