Let's be honest: Most investors love (NYSE: SHOP) stock because of how much it's gone up in the past. The company went public less than 10 years ago and is already up close to 3,000%. For perspective, $1,000 invested in Shopify stock when it went public would be worth more than $30,000 today.

For some investors, Shopify is nothing more than a stock ticker. But it's crucial to understand what a stock's underlying business does, rather than only pay attention to the movement of its ticker.

Here's one small part of Shopify's business that has an outsize impact on profits.

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Source Fool.com