What is the relationship between substitute and complementary goods in the context of consumer preferences and purchasing behavior?

Substitute goods are products that can be used in place of each other, while complementary goods are products that are used together. Consumer preferences and purchasing behavior are influenced by the availability and pricing of substitute and complementary goods. When the price of a substitute good decreases, consumers may switch to that option, affecting demand for the original product. On the other hand, changes in the price or availability of complementary goods can also impact consumer choices and purchasing decisions.