incremental

Incremental refers to gradual small increases in a series, often by a regular amount. For example, "10, 13, 16, 19, 22 ...".
The positive incremental profit in our investments makes our clients happy.

In some cases such as risk calculations or math formulas, incremental series go down when the incremental variable (increment) is negative.
For example, "22+(-3)+(-3)+(-3) ..."