Talk:Ghoul Countermeasures Law/@comment-24.149.32.226-20170217214304/@comment-4872828-20190715150756

Assuming 1 million ghouls among a global population of roughtly 8 billion people is extremely high for a predator species, especially when you reason that by necessity, ghouls have to live relatively near large populations (within striking distance of cities). Predator animal species that don't target humans often don't have that large of numbers, and global populations of people of a million would tend to draw more attention, even if spread out across the world in a diaspora.

There's actually a mathematical formula for determining predator-prey numbers:

https://en.wikipedia.org/wiki/Lotka–Volterra_equations

You also have consider the other constraining factors.


 * Most ghouls don't live to be 50 or anywhere near in the wild. Ghouls seem to live to be peak reproduction ages before being killed, either by humans or other ghouls.  Assuming a human per month, the average ghoul has probably eaten 300 people.  That sounds like a lot...except if you're 25 years old you probably personally know at least 300 people who died.  In population dense regions, that's nothing.  Think about how many people die of suicide and accidents per year (way more than murder, actually).


 * Ghouls also, from what we have seem, have a very low replacement rate, even lower than that of the human populace.  Aside from the really rich ghouls, most ghouls barely even have families from what we've seen as they tend to lose parents at a young age


 * Plus, unlike animal predators, ghouls think like us, communicate like us.  For sheer self-reservation alone, they know not to get too large of a population.

This series takes place in Tokyo, one of the most population dense and populous regions in the world. Not to be cold, but there are people to spare. If anything, given Japan's demographics (as well as Eurpoe and the US), there are more people dying than being born, and ghouls can consume recently dead individuals. A population of sentient necrophages would be a benefit.