bundled business mail that is discounted from the equivalent single-piece rates. This is an incentive to the mailer to precancel, presort, barcode or otherwise reduce the required processing by the Postal Service. <#firstclass=First Class> quantity mailings are discounted at reduced per-piece rates. <#thirdclass=Third Class> (<#stdmail=Standard Mail>) quantity mailings are discounted at <#bulkrate=bulk rates>.