A task force led by the Treasury is calling for the U.S. Postal Service to push up shipping prices on certain packages, threatening to impact Amazon and its cohort of e-commerce rivals such as Target and Walmart, Axios reports. The task force says the USPS should sort commercial packages and mail separately, and charge market-based prices for the former. Such a move would wipe out affordability guarantees on deliveries from the likes of Amazon, which currently uses the USPS for 45% of its packages.