The demand for torch and batteries is an example of

The demand for torch and batteries is an example of complementary demand. Complementary goods are products that are used together, such that the demand for one good is influenced by the demand for the other. In this case, the demand for batteries is complementary to the demand for torches, as torches require batteries to function properly. If the demand for torches increases, the demand for batteries will also increase as more people will need to buy batteries to power their torches. Similarly, if the demand for batteries increases, the demand for torches will also increase, as more people will need torches to use with their batteries. This shows the complementary relationship between the demand for torches and batteries.