If the price of a complementary good rises, it will always lead to an increase in demand for an inferior good, regardless of consumer income levels.

Complementary goods are products that are often used together, like printers and ink cartridges. When the price of a complementary good goes up, people might buy less of that good because it costs more. For example, if the price of ink cartridges rises, some people might choose to print less, which means they won't need to buy as many printers. However, if they still need to print but can’t afford expensive options, they might turn to cheaper or inferior goods, like a basic printer model. This shift happens because people look for alternatives when prices change, showing how the demand for inferior goods can increase even when consumer incomes vary.