Motor oil and gasoline are complements. If the price of motor oil increases, consumer surplus in the gasoline market may increase, decrease, or remain unchanged.
In terms of consumption, two things are complementary if they are typically consumed together. The two products that are frequently consumed together by customers are motor oil and gasoline. Similar to replacements, two things might make good or bad complements. The two things are always consumed together, often in some set proportion, if they are ideal complements.
For the majority of consumers, the right and left shoes are an example of the ideal complement. It is challenging to purchase the two items separately because they are frequently consumed together. Again, each buyer must decide for themselves if a product is a substitute, a complement, or unrelated to another.
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