What is an input-output table?
There is a basic lecture about input output tables at the following URL.
Also at http://www.scotland.gov.uk/about/FCSD/OCEA/00014713/index.aspx
Canada has been one of the world leaders in the building of these tables. For instance, we developed a rectangular table as opposed to the traditional square ones. Kishori Lal has published some articles on the evolution of the Canadian tables but you need the above primers to undertand what he is talking about. See
Basically, an I/O table allows the researcher to do 'what if analysis'.
They can be constructed at various different levels and for different sectors of the economy.
Information on the interprovincial IO tables is at:
Also see the publication:
15F0077GIE - A Guide to Deflating the Input-Output Accounts: Sources and methods