16) Explain how the following factors will shift the supply curve for sparkling wine: a) New irrigation technology improves the average yield of a vineyard. b) Following an increase in the immigration of unskilled labor, the wages of wine-grape pickers fall. c) The government sets a minimum wage for seasonal employment. 1 17) What are the key features of a perfectly competitive market? 18) Explain how the following will affect the supply curve of coffee. A fall in the wages paid to coffee workers An increase in the availability of high-yielding coffee plants A decrease in the quantity of land under coffee cultivation a) b) c) 19) If there is excess demand in a perfectly competitive market, does the government need to intervene to restore the equilibrium price and quantity? Why or why not? 20) The market demand schedule and supply schedule for digital cameras is shown in the table below. Illustrate the answers with the help of a graph