The World Trade Organization (WTO) estimates that India has the largest levels of trade protection of any major economy. The highest tariffs are imposed on products from the primary sector. For example, in 2018 India imposed a tariff of approximately 90% on imports of coffee to protect its coffee farmers. However, the markets for coffee substitutes and complements do not have such levels of government intervention.
b) Explain how the price of coffee substitutes and complements can affect the demand for coffee. [4]