>>11368168Depression is an umbrella term for underlying causes which are incorrectly lumped together. One type is due to malnutrition and gut flora issues, another is due to toxic load and neuroinflammation, the last is due to psychological factors and life conditions where you probably SHOULD feel depressed. They are all heavily interconnected but nonetheless discrete.
The level of brain damage depends on the cause.
>>11368233This is correct, but a stupid level of oversimplification. People don't buy things for literally zero reason, generally. You don't understand the model as well as you think.
Hint, manufacturing demand.
