Proposed price hikes on letters, postcards and parcels could cost Amazon $400 million to $1.1 billion, according to an estimate from Credit Suisse analyst Stephen Ju, reported by CNBC . The pending rate changes are designed to “keep the Postal Service competitive while providing the agency with needed revenue,” according to the agency. On the back of this estimate, along with other expected carrier rate hikes and rising labor costs due to a recent company-wide minimum wage hike , the bank cut Amazon’s near-term profit estimate.