Which curve shifts and in which direction when the following events occur in the tax accounting market? a. "It is almost tax day (April 15)!" Demand decreases. Supply increases. Demand increases. Supply decreases. Neither curve changes. b. A new software is developed that helps individuals file their taxes on their own. Demand decreases. Demand increases. Supply increases. Neither curve changes. Supply decreases. c. There is a change in the law and tax accountants now only need one year of training to prepare taxes. Neither curve changes. Supply increases. Supply decreases. Demand decreases. Demand increases.