Round-number level

A round-number level is a price ending in a run of zeros — a whole figure, or the half figure between two of them — treated as a reference point simply because it is easy to state. The reasoning behind the practice is that instructions are more often placed at prices people can say out loud than at arbitrary ones, so resting orders accumulate at these prices, and resting orders are what price interacts with when it arrives. That much is about how orders are expressed rather than about anything the market itself defines: no venue treats a round number differently from any other price, and nothing in a quote marks one out. Whether the accumulation at any particular level is large enough to matter is not visible on a chart, which shows where price went and not what was waiting where. Round numbers are also the prices at which readers most often place their own protective and target instructions, which is one reason the levels appear in commentary far more often than the chart alone would justify.