Substitutes and complements
Every product in the marketplace has substitutes and complements. A substitute is another product you might buy if the first product is too expensive. Chicken is a substitute for beef. If youâre a chicken farmer and the price of beef goes up, the people will want more chicken, and you will sell more.
A complement is a product that you usually buy together with another product. Gas and cars are complements. Computer hardware is a classic complement of computer operating systems. And babysitters are a complement of dinner at fine restaurants. In a small town, when the local five star restaurant has a two-for-one Valentineâs day special, the local babysitters double their rates. (Actually, the nine-year-olds get roped into early service.)
All else being equal, demand for a product increases when the prices of its complements decrease.
Smart companies try to commoditize their productsâ complements.
https://www.joelonsoftware.com/2002/06/12/strategy-letter-v/