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What {happens) to the equilibrium price of a product when its quantity {supplied) by producers {changes)"? For example, with an improvement in technology of wheat production wheat farmers {wish) and {to be) able {to supply) more wheat at a given price than they {did) before. How does it {influence) the equilibrium price? Clearly, it {falls). But if the weather {is) poor, the {supplied) quantity of wheat {decreases). How does it {influence) the equilibrium price? It {goes) up. In 1984, police officers (concerned) with narcotics consumption in the United States {showed) what a change in {supplied) quantity {can) {do). There {was) a massive increase in the quantity of coca production in South America and the quantity of cocaine {supplied) to the United States {rose) dramatically. The result {was) a big fall in the price of cocaine. In some parts of the United States, cocaine {was sold) in 1984 for one-half to one-third the price of a year before. One of federal officials {said): "At no time in the modern history of international drug control the price of a drug {had dropped) by half so quickly."