Which one of the following is the basis of the comparative cost theory of david ricardo?
a. supply and demand
c. labour theory of value
b. benefit theory of trade
d. marginal utility theory

muslims control the north africa during the period of 1500 up

to 1800. they made a barrier to prevent further european exploration from

entering the africa from the north. however, the dutch ware still able to move

toward the interior with having south africa as one of the routes leading to

the east for trading with asia.

answer/// equals both average variable cost and average total cost at their respective minimums;