The models exist and they are being used in the United States.
On October 27th, 2009. See this statement in context.
On October 27th, 2009. See this statement in context.
October 27th, 2009 / 4:25 p.m.
Parliamentary Budget Officer, Library of Parliament
The models exist and they are being used in the United States.
See context to find out what was said next.