a barrier to entry and exit (e.g., a costly car vs inexpensive gas)

Gross complements

Sometimes the complement-relationship between two goods is not intuitive and must be verified by inspecting the cross-elasticity of demand using market data.

Mosak's definition states "a good is a gross complement of if is negative, where for denotes the ordinary individual demand for a certain good." In fact, in Mosak's case, is not a gross complement of but is a gross complement of . The elasticity does not need to be symmetrical.

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