A comparison of economic impacts with the use of economic base and input-output methodologies

Single equation economic base methodology as employed in this paper is briefly outlined together with its limitations and advantages relative to input-output methodology. Both methodologies are utilized to derive alternative estimates of a port's impact on output, income, and employment in the surrounding region. Economic base impacts were up to 5% larger than type 1 input-output impacts and up to 17% smaller than type 2 impacts.