Match the pairs to their respective categories. tea - coffee
printer - ink cartridge
butter - margarine
petroleum - natural gas
pen-refill

PAIRS OF SUBSTITUTES

PAIRS OF COMPLEMENTARY GOODS

PAIRS OF SUBSTITUTES

tea - coffee  

butter - margarine

petroleum - natural gas

PAIRS OF COMPLEMENTARY GOODS

printer - ink cartridge

pen-refill

Explanation:

Substitutes are goods that can replace other goods.   On the other hand, complementary goods go hand in hand with one another.  This implies that while substitutes can be used in isolation, complementary goods cannot be used in isolation of each other.  For example, if one needs a pen, they also require a refill.

answer; /// i believe the correct answer is (all of the above);

answer; (inseparability);