Market share dynamics in action
Amazon (AMZN +1.41%) is one of the world's largest companies and has market leadership in some very influential business categories. The company that helped spearhead the growth of the e-commerce industry remains by far the biggest online-retail player in the U.S. market. It's also the second-largest overall retailer by revenue in the country, with only Walmart (WMT -0.26%) generating more sales in the category.
Not only is Amazon a retail giant, but it's also the current market leader in cloud infrastructure services. Amazon Web Services accounts for more than 30% of the total cloud market and is a huge profit generator for the company. On the other hand, Microsoft (MSFT -0.02%) has been gaining market share at an impressive clip in recent years and now accounts for more than 20% of category revenue. The overall size of the cloud services market has continued to increase. So have Amazon's sales in the category, but it's got a powerful competitor nipping at its heels.