The spot price is the wholesale reference price for immediate delivery of gold or silver in large professional markets. It gives stackers a benchmark for judging whether a coin, round, or bar is fairly priced compared with the underlying metal value.

However, stackers almost never buy physical metal exactly at spot. Retail products include premiums for fabrication, minting, distribution, dealer margin, shipping, insurance, and market scarcity. During periods of high demand, the premium can widen sharply even if the quoted spot price is stable or falling.

A reliable stacker compares the full buy price to spot and also checks the likely resale bid. The real cost is not only the price paid above spot, but the spread between what the stacker pays and what a dealer or private buyer would pay when the metal is sold.