When the incremental ROR method is applied, the entire investment must return at least the
MARR. When the i * values on several alternatives exceed the MARR, incremental ROR evaluation
is required. (For revenue alternatives, if not even one i * MARR, the do-nothing alternative is selected.)
For all alternatives (revenue or cost), the incremental investment must be separately justifi ed.
If the return on the extra investment equals or exceeds the MARR, then the extra investment should
be made in order to maximize the total return on the money available, as discussed in Section 8.1.