Record absolute change when the initial value is zero

Input and processing example

처음 / initial: 0 · 나중 / later: 20
절대 변화 / absolute change: +20
일반 증감률 / ordinary percentage change: 계산 불가 / undefined

Steps to verify

• Check the initial value is positive.
• Record absolute difference for zero.
• Explain periods and meaning.

How to interpret the result

URLTO change mode requires a positive initial value. For activity starting at zero, describe the absolute change and new occurrence.

Deciding what to do next

Substituting a tiny positive value changes the real baseline. Retain the original zero and mark the ratio undefined.

Feature scope

Calculate portions, final discounted prices and changes in the browser. Change mode requires a positive initial value and does not automatically apply tax, compounding or accounting rules.