The impact of a new convention center or a new firm entering or leaving a region requires the use of multipliers to estimate the full economic effect. Multipliers account for the interactions from industries to industries and from industries to households and back, and are produced easily from input-output studies.
Corcoran, W. J., "Omaha Metropolitan Statistical Area Input-Output Tables and Multipliers: A User's Manual -- A Guide for Identifying and Assessing the Effects of Business Changes on the Omaha Economy" (1988). Publications. 311.