"Since P3 contracts typically lump together designing, building, financing, maintaining, sometimes operating the facility, they tend to be honking big numbers because you're packaging so much together. To the extent that crooks are attracted to the really big-ticket items, it makes it that much more attractive as a target for misbehaviour," said Thomas Ross, director of the Phelps Centre for the Study of Government and Business at the University of British Columbia. "That's not saying it's P3, it's the size."