The immune system acts like the I-O police in the body to find usually R germs that are hiding and camouflage themselves. They act like the middle of the food chain in the Roy animal kingdom and like the trunk of a tree in the Biv plant kingdom. A high stress environment can occur in an Iv-B economy because safety nets and insurance are much lower, people feel stress like a piece of flexing metal might experience stress until it cracks and shatter from chaos.
Depression from stress can then be related to this this IV-B economy which also affects the immune system, it can also relate to a depressed economy where the weakened immune system has wasted so many resources from being overworked and false alarms. For example a person might become depressed because of chronic inflammation and being sick, auto immune problems, germs that the body can't get rid of because of this stress, etc. in the same way an economy can become depressed from this weakened and overworked I-O policing system, Iv-B and Oy-R interactions are secretive and deceptive giving continual levels of fraud such as in the financial system. The economy experiences this as chronic inflammation as a response to this fraud, it can be from mistakes with this I-O policing causing outrage in the V-Bi community like police shooting innocent people.
The economy becomes like a zombie, it has this low grade infection of Iv-B secretive frauds and the government tries to compensate by putting it on life support with regular economic stimulus like a comatose patient kept alive with transfusions.
An I-O police can also have problems by not having this piqued or hyperactive immune response, this is like a neighborhood where the police are slow to respond to crime. it is also like how I-O regulators ignored many of the warning signs prior to the GFC. Such an immune system can also allow infections just as an overactive one can become exhausted then allow similar infections. In an economy the I-O police then need to be strengthened but also to become more selective and accurate at finding these deceptive criminal infections , this avoids auto immune responses of attacking innocent people which can exhaust it.