Country a and country b both increase their capital stock by one unit. output in country a increases by 10 while output in country b increases by 8. other things the same, diminishing returns implies that country a is:

Country A is poorer than country B. If another unit of capital is added to Country A, Output will surely increase, but by less than 10 units.

Explanation:

Diminishing returns is the decrease in output experienced by increasing a single factor of production, while keeping all other factors constant.

answer would be b, a tariffs main purpose is to protect domestic production and jobs.