Suppose the production of 1 unit of mining requires 2/5 unit of mining, 2/5 unit of manufacturing, and 1/5 unit of communication. To produce 1 unit of manufacturing requires 1/2 of mining, 1/4 of manufacturing, and 1/4 of communication. To produce 1 unit of communication requires O units of mining, 3/5 units of manufacturing, and 2/5 units of communication. a.) Set up a 3 by 3 matrix for the input-output model b.) Find the ratio of the three commodities in the closed model.

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