Supply and demand or in this case, a bottleneck hold on a supply network that has shifted from warehousing months towards a just in time production/distribution

Supply and demand or in this case, a bottleneck hold on a supply network that has shifted from warehousing months towards a just in time production/distribution model and with that, more susceptible to any bumps. This causes shortage spikes and price rises of new, which drive up the corresponding second hand offerings. Same way hard drives a few years back increased in price, supply and demand as a factory went out of action for a while, curtailing market supply. Also why external USB drives became source of HD's as they had a larger supply buffer as less popular at the time and more in warehouses/stores.