We are working with an Arizona industry group on a contribution study. The membership includes ready mix concrete firms, sand and gravel companies, and stone crushing operations. The association is interested in direct and total impacts of the combined membership including multiplier effects. Sand and gravel and stone are major inputs to ready mix so I am wondering if there is a case study or suggested approach when the overall industry/grouping to be modeled includes firms that supply intermediate inputs to other members of the group. We do have the value of output/sales/shipments, employment and payroll for each component (sand and gravel, crushed stone, and ready mix) for 2014. Thanks for any advice or direction on this
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