Final answer:
A leftward shift in the supply curve for a good will cause an increase in price and a decrease in quantity.
Step-by-step explanation:
A leftward shift in the supply curve for a good will tend to cause an increase in price and a decrease in quantity. This is because a decrease in supply means that there is less of the good available in the market, which leads to an increase in price. At the same time, there is a decrease in the quantity of the good that consumers can purchase at the higher price.