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Indicators for sustainability assessment 109

$400
$200
$0
Bagasse
–$200
O&M costs
NPV (mi US$) –$600 Investment
–$400
Interest
–$800
tax)
–$1.000 IRPJ—35% (Brazilian
PIS-COFINS—18%
(Brazilian tax)
–$1.200
Lobor costs
–$1.400
–$1.600
–100% –50% 0% 50% 100%
Percentage variation of production costs
Fig. 4.20 Sensitivity of production and capital costs in the FT case.

The sensitivity analysis, shown in Figs. 19 and 20, indicates the behavior
of NPV for variations in economic parameters (e.g., product sale tariffs, cap-
ital cost, interest rate, production costs). The higher the slope of the line cor-
responding to the parameter, the greater its influence on NPV. Therefore
the combination of economic analysis and sensitivity analysis enables the
evaluation of the economic viability of the enterprise, also determining
which products can contribute more significantly to financial viability and
what costs influence the final economic result the most.

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