The future looks so bleak, I don't believe the vast majority of "survivors" among us will have the least interest in buying or selling what audio equipment we have. I can see periods of power rationing where cooking a meal, heating water and charging our devices (and cars?

) will be top priorities of energy use, let alone time to sit listening to our favorite tunes. Much of our gear, if we decide to keep it for
someday when times are brighter, or for our uninterested grandchildren will probably be mothballed in closets and attics. We may be unable to get replacement parts from Asia for basic circuitry. If many of us are housed in pods or shoebox accommodations, there will be no room for audio systems bigger than an iphone and set of headphones.
The West is in the beginning throes of collapse. Normal has forever gone. One can discuss the state of the economy at the macro level, but on a day to day basis, how our lives will change will be biblical. We will be scavengers on the ruins of our technical prowess of the 20th century. Any talk about merely another recession coming is only to prevent us from panicking. We are looking at the 1930s on steroids and a duration that could last decades. And that is a best case scenario.
As for current prices on audio equipment, routine visits to thrift shops, pawn shops, yard sales etc. where equipment is being given away by people just trying to get rid of estates of family members will yield best values. People who try to sell their stuff on CL or FBM etc. will be looking for the biggest buck. Unless they are extremely desperate to sell, they will not all break but decide to keep their gear until a hoped for price recovery, which will never happen... So enjoy it while you still can.