Plenty happened in online retail in 2019, from high-valued acquisitions to retailers pushing their fulfillment operations to new speeds.

Beyond these headlines, topics including online sales in China, marketplace seller fees and millennial shopping patterns are among the most popular on DigitalCommerce360.com.

The following are the top 10 most popular stories for Digital Commerce 360 Retail readers in 2019:

1. Millennials now do 60% of their shopping online
   A CouponFollow survey also finds millennials make 36% of their total purchases using mobile devices, up 20 percentage points from 2017. Plus, 64% of the millennial online shoppers make half or more or their online purchases from Amazon.com Inc.
2. Amazon charges millions for a spot in its gift guide
   Amazon sells Holiday Toy List sponsorships for as much as $2 million, according to documents reviewed by Bloomberg. The more sponsors pay, the more products they can nominate to be on the list and the more prominently their own products will be featured on the popular website.
3. Top 10 online retailers: How the largest online retailers in the world fared in 2018
   15% of all retail spending happened online last year. Digital Commerce 360’s new report offers an early look at how the biggest online merchants and marketplaces around the world performed and are growing quickly.
4. Online retail sales in China grew nearly 24% in 2018, its government says
   China’s retail market will become the largest in the world, exceeding sales in that of the United States in 2019 and topping $6 trillion in 2020, an analysis says.
5. Poshmark will begin collecting and remitting sales tax for marketplace sellers
   Poshmark’s program goes beyond where marketplace facilitator laws have gone into effect. All eligible orders will be taxed on sellers’ behalf.
6. New York establishes its online sales tax rules. And retailers need to start complying right away.
   Unlike most other states that have put online sales tax rules or laws into effect, New York isn’t giving merchants any wiggle room, as the rules are in effect immediately.
7. Petco closes ecommerce pioneer DrsFosterSmith.com
   Facing threats from larger online competitors like Amazon and Chewy, Petco says it is streamlining operations to focus on the core Petco business. Drs. Foster and Smith was the biggest online retailer of pet supplies when Petco bought it in 2015.
8. Why Patagonia changed its mission statement
   Outdoor apparel retailer Patagonia has recently taken more of a political stand to protect the environment, in addition to its focus on a sustainable supply chain. CEO Rose Marcario discusses Patagonia’s new mission at NRF 2019.
9. PayPal will no longer reimburse sellers for fees when it processes refunds for buyers
   PayPal will keep the fees it originally charged sellers for the purchase.
10. How many private-label brands did Amazon add in Q4?
    Amazon.com now sells more than 450 if its own brands or brands sold exclusively on Amazon, according to a new report from TJI Research Inc., a market research firm that tracks Amazon.