Baird analyst Colin Sebastian says the Supreme Court ruling in favor of South Dakota over Wayfair (W) does not change his positive sector view on e-commerce. The analyst recommends buying shares of Amazon.com (AMZN), eBay (EBAY) and Shopify on weakness related to today’s headlines. While other states are now likely to enact similar sales tax legislation, the financial impact to e-commerce companies is likely to be modest, Sebastian tells investors in a research note titled “Online Sales Tax Ruling a Slight Negative, Headlines More Bark Than Bite.” He believes the benefits of convenience and selection are larger drivers of e-commerce share gains compared to low pricing and tax avoidance.