Talk:Input–output model

	Business and economics portal This article is within the scope of WikiProject Economics, a collaborative effort to improve the coverage of Economics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.EconomicsWikipedia:WikiProject EconomicsTemplate:WikiProject EconomicsEconomics
???	This article has not yet received a rating on Wikipedia's content assessment scale.
???	This article has not yet received a rating on the project's importance scale.

This article is based on class notes developed by William Lewis Garrison, and edited by User:DavidLevinson and used with permission.

aaa I want to insert the equation $$ X = \left[ {\matrix

  {x_1 }  \\ 
  {x_2 }  \\ 
  {x_3 }  \\ 
  {x_4 }  \\

\endmatrix } \right]\quad C = \left[ {\matrix
  {c_1 }  \\ 
  {c_2 }  \\ 
  {c_3 }  \\ 
  {c_4 }  \\

\endmatrix } \right]\quad I = \left[ {\matrix
  1 & 0 & 0 & 0  \\ 
  0 & 1 & 0 & 0  \\ 
  0 & 0 & 1 & 0  \\ 
  0 & 0 & 0 & 1  \\

\endmatrix } \right]\;A = \left[ {\matrix
  {a_{11} } & {} & {} & {a_{14} }  \\ 
  {} & {} & {} & {}  \\ 
  {} & {} & {} & {}  \\ 
  {a_{41} } & {} & {} & {a_{44} }  \\

\endmatrix } \right]

$$

but the software can't parse. dml 13:38, 9 Oct 2004 (UTC)

Yes they should be merged, but I suspect that in time both shall be supplanted with deeper more thorough entries.

MikelahrMike Lahr

Support merge JQ 23:06, 6 May 2006 (UTC)[reply]

title should be changed

title should be:

Input-output model (economics)

Grave error in explainaition of concept?

I was reading the following paragraph to try to get a grasp of the concept: Each row of the input-output matrix reports the monetary value of an industry's inputs and each column represents the value of an industry's outputs. Suppose there are three industries. Row 1 reports the value of inputs to Industry 1 from Industries 1, 2, and 3. Rows 2 and 3 do the same for those industries. Column 1 reports the value of outputs from Industry 1 to Industries 1, 2, and 3. Columns 2 and 3 do the same for the other industries.

Comparing that to my other source (a 10 page copy from a book with a chapter called "Foundations of Input-Output analysis", i don't know what the book is called but it looks like it's quite credible) the whole paragraph above seems to be opposite of what is correct.

Here is one example from the book: X 1 2 1 0.15 0.25 2 0.20 0.05

And the text says: "To produce one dollar worth of goods from sector 2 one needs as interindustry ingredients 25cents worth of good 1 and 5cents worth of good 2." I would translate that to: Column 2 reports the value of inputs to Industry 2 from Industries 1 and 2. Opposite of what the paragraph in the wikipedia article says.

Can someone correct me or verify this? I'm new to this whole concept.

-Marius