Two inputs ______ when they must be combined in a fixed ratio.

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Perfect complements are two inputs that must be combined in a fixed ratio. For example, a left shoe and a right shoe must be used together in a fixed ratio of 1:1, making them perfect complements. Perfect substitutes, on the other hand, can be used in place of one another in any ratio, while Cobb-Douglas technology represents a specific production function that incorporates multiple inputs. Fixed inputs are those that cannot be adjusted in the short run.

Two Inputs ______ When They Must Be Combined in a Fixed