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