After a week of shuttling to meetings in and around Seattle not one taxi receipt signed by a driver. It is in part, an implicit assumption between driver and passenger that you can tip well without incurring a personal cost, and inflate the expense claim later. The less obvious victim in this equation is a passenger that submits an accurate expense claim – knowing that the finance department knows how easy it is to fiddle this kind of expense, and feeling guilty by association.

The practice of giving blank receipts, widespread enabler of everyday corruption.