Supply and Demand Zones: Drawing Rules and Limits

State how the region is selected

Technical analysis commonly discusses support and resistance around past price behavior. Fidelity describes this chart-based framework. Supply/demand-zone approaches often extend a line into a region based on a consolidation before a move. There is no single universal boundary formula shared by every author or indicator.

A practical definition can specify a maximum number of base candles, their permitted range, a minimum departure distance and the time available for that departure. Such a rule is an illustrative research convention, not proof that the region contains unfilled orders. It should be recorded before later price visits are observed.

An original demand-zone construction

Suppose three completed base candles have lows between 49 and 49.50 and highs between 50.50 and 51. A subsequent two-bar move closes above 54. An illustrative rule marks the complete base range, 49 to 51, after the qualifying departure has occurred.

A body-only variant might produce a narrower region, perhaps 49.75 to 50.50. If price later reaches 50.80, it visits the full-range zone but not that narrower version. The difference is a measurement choice, not evidence that one observer understands hidden supply better.

Assume the declared failure rule is a completed close below 49 within the next twenty observations. A later close of 48.50 records a failure, even if price subsequently recovers to 55. A study must retain the original horizon and outcome rule rather than extending the holding period until a favorable story appears.

Separate a past region from present liquidity

A fast departure records what prices did during a historical interval. It does not reveal whether previously resting orders were filled, canceled, replaced or never present in the assumed quantities. A drawn rectangle is therefore different from an exchange order book.

Even a live order book represents only its available venue coverage and displayed orders at a particular time. Liquidity changes. A historical zone drawn on a broker's FX chart cannot be treated as a complete inventory of global currency demand or supply.

Count visits and overlaps consistently

Specify whether repeated entries into a zone count as one test or several. Decide whether a new nearby region replaces an old one, merges with it or stays separate. Also define how gaps that jump across a region are recorded, because they may provide no executable price inside it.

These details matter when comparing a claimed retest rate. Ten overlapping rectangles surrounding one price event are not ten independent observations. Keep the original detection time and avoid drawing the base as a known signal before the later departure that qualified it.

Compare specific order-block conventions, inspect what an order book measures, and log candidate outcomes with the journal workflow. The useful result is a clearly defined region and testable observation process, with failures included, rather than a claim that price owes the zone a profitable reaction.