Answer:
The correct answer is: decrease; increase.
Explanation:
There is a decrease in demand when the curve shifts to the left and down. It is determined by:
Decrease in consumer income
Increase in the price of complementary goods
Decrease in the price of substitute goods
Change of consumer preferences.
The decrease in demand means that even the same price, less quantity of the good is demanded or when the price decreases buying the same quantity of the good.