Consider the IS curve 𝑌 ~ 𝑡 = 𝑎 ¯ − 𝑏 ¯ ( 𝑅 𝑡 − 𝑟 ¯ ) + 𝑥 ¯ 𝑌 ~ 𝑡 , where 𝑏 ¯ = 1 , 𝑥 ¯ = 1 / 5 , and 𝑅 𝑡 − 𝑟 ¯ = 0.01 . If there is a positive demand shock where the economy goes from 𝑎 ¯ = 0 to 𝑎 ¯ = 0.02 , then short-run output changes by ______ percentage points (holding 𝑅 𝑡 constant). Enter a negative number for a fall in short-run output and a positive number for a rise in short-run output.数值题