The Black Market earned its name because it was a place to trade items not meant for public display. It had both advantages and disadvantages. For instance, the vast majority of goods were second-hand, transactions often involved old-fashioned bartering, or it was a place for dealing with clearance stock.
Overall, the Black Market boasted many excellent finds across a wide array of categories; one could find almost anything imaginable there.
The high-end market, however, was different. Its advantage lay in offering items unavailable in the Black Market. All products there came with a traceability code. What did that imply? It meant that every item, regardless of its nature, was legitimately authorized for trade via big data, recognized by the state, and included after-sales support.
The most significant difference was that most goods here were newly produced post-apocalypse.
This meant the items within were high-cost and extremely expensive.