simultaneously to find types of expansion which fit both economic and en-
vironmental goals. One way to do this would be to rank industries high or
low according to whether economic multipliers are above or below average,
A low-high pattern for environmental and economic effects would be preferred
over all other combinations. Table 9 illustrates the method of comparison
using employment and sulfuroxide (SO ) multipliers (SOX is used because it
is felt this is one of the most complete data sets among the pollution co-
efficients.) The ratio of the SOX-output multiplier to the employment
multiplier is a "tradeoff ratio" as described above because it gives how
much additional SOX in the environment must be traded to gain a unit in-
crease in employment.
 If more than two factors are being compared, choice of preferred indus-
tries becomes more difficult. For example, an industry causing the least
increase in SOX per employee may be worst in terms of water use per employee,
Several sets of tradeoff ratios would then have to be considered and the
choice of preferred industries would then depend on the relative importance
of the economic and environmental factors described in the tradeoff ratios,
 The analysis of effects of industrial development described here was
based on only one "round" of expansionary effects. Another round of devel-
opment effects could occur if a new firm entering the county causes new
residents to enter the county to fill employment needs when local employment
supply is not sufficient. The results of such a secondary occurrence can
also be analyzed with input-output analysis as will be described below,
 Another type of secondary expansion which could occur is that still
more new industries will move to the region in response to expansion in one
sector. For example, arrival of a new fabric manufacturing plant in the
region may influence related industries such as clothing manufacturers and
notions manufacturers also to locate in the region, The nature and amount
of such expansion is difficult to predict, The most that can be said is
that such expansion would tend to be among those industries which are re-
lated to the initial industry. The actual numbers and sizes of expanding
industries would depend on many factors such as transportation costs, labor
costs, etc. The national input-output table (Table B2) serves as a guide
for understanding which industries are related to which on the basis of
purchases.