Suppose there is a fall in the price of a good from ​$ to half the​ price, the quantity demanded increases from x to 3x​ units, and the price elasticity of demand is . Now suppose there is an increase in the price of a good from ​$ to double its price and the price elasticity is . The elasticity is enter your response here ​, and remains the same regardless of an increase or decrease in price. ​(Round your response to two decimal places​.) This is known as ▼ income elasticity arc elasticity cross-price elasticity .