In 2016, a company repurchased 1,000 shares of common stock for $20 a share. In 2018, all this repurchased stock was resold for $21 a share. The par value of the common stock is $1. What is the net effect on the company's 2018 stockholders' equity from the 2018 sale of repurchased stock? Total stockholders' equity decreases by $18,000 Total stockholders' equity increases by $21,000 Total stockholders' equity decreases by $1,000 Total stockholders' equity decreases by $21,000 Total stockholders' equity increases by $1,000 Total stockholders' equity increases by $20,000