Consider the market for high-speed satellite Internet access service, which is a normal good. Explain whether the following events would cause an increase or a decrease in demand or an increase or a decrease in the quantity demanded.
a. Firms providing cable (an alternative to satellite) Internet access services reduce their prices.
b. Firms providing high-speed satellite Internet access services reduce their prices.
c. There is a decrease in the incomes earned by consumers of high-speed satellite Internet access services.
d. Consumers' tastes shift away from using cable lines for Internet access in favor of satellite Internet access services.