For the first time I've stumbled upon following notation:
$$ \Delta X_{ji} / X_{ijji}$$
It is described as "given the percentage reduction in total inputs"
Context: paper in economics. Describes manipulations for matrices that describe economic activitiy (e.g. in which sector i supplies a certain amount of goods to sector j).
Appreciate any help. I would guess it means
$$ \Delta X_{ji} / X_{ij} X_{ji}$$ but can someone verify?