On April 3, 2014, Wang Chao's father bought 1,000 shares of a certain company at a price of 12 yuan per share. On April 23, Wang Chao's father's stock rose to 13 yuan. The market value of Wang Chao's father's stock has increased how much?
2014年4月3日，王超的爸爸以每股12元的价格购进了某公司的股票1000股，4月23日王超爸爸的股票升至13元，王超爸爸的股票市值多了多少元？
<gadget id="calculator">13 * 1_000</gadget>
<output>13_000</output>

<gadget id="calculator">12 * 1_000</gadget>
<output>12_000</output>

<gadget id="calculator">13_000 - 12_000</gadget>
<output>1_000</output>

<result>1_000</result>