Another difficulty with technical coefficients has to do with the measurement of output in terms of dollar prices. The technical coeffi- cients (the ratio of dollar purchases to dollar sales) are not in dollar units; however, if prices should change disproportionally this may cause coefficients to change. Similar shortcomings can be described for use of constant employment, income, import, resource and other coefficients, These shortcomings due to the assumptions of input-output analysis must be considered in making use of input-output analysis. However, these shortcomings can be eliminated only by frequent primary data collection efforts. ECONOMIC MULTIPLIERS The main use of an input-output model as described in the previous section is the development of interdependence coefficients and multipliers. The following discussion presents various multipliers for Lee County both for illustration purposes and for use in any county similar to Lee County with economic structure based mainly on agriculture, construction, ser- vices, and government, Table Cl defines the sectors used in this study. Table C3 shows the economic structure of Lee County by sector for compar- ison purposes. Interdependence coefficients for Lee County are shown in Table 1. A column in Table 1 shows the change in output of regional sectors due to a change in final demand in a given sector corresponding to the column, For example, as shown in column 2, an increase of one dollar export of live,- stock products increases demand for agricultural services by $,029, demand for crops by $.30, real estate by $.056, etc. Summing the interdependence coefficients in the column for each sector gives the total output multiplier for a sector as shown in Table 2. These multipliers express the total expansionary effects on the economy of in- creasing final demand in each sector, For example, a dollar increase in export of livestock products would increase the value of total regional output by $1.56 (i.e., there is an $.56 indirect expansion of output), Sectors in Lee County with the largest output multipliers are agricultural services, livestock products, fresh and frozen food processing, electric and gas utilities, business services, and recreation; expansion of exports