What would happen to the equilibrium price and quantity of coffee if the wages of coffee-bean pickers fell and the price of tea fell?

Question

Quizplus · Accepted Answer

The decrease in wages of coffee-bean pickers will lower the production cost of coffee, leading to an increase in the supply of coffee, which will shift the supply curve to the right. This will cause the equilibrium price of coffee to fall. 
The decrease in the price of tea will increase the demand for tea, which may lead some consumers to substitute coffee with tea, causing the demand for coffee to decrease. However, the magnitude of this effect is uncertain. Thus, the effect on the equilibrium quantity of coffee is ambiguous.

What Would Happen to the Equilibrium Price and Quantity of Coffee