The demand and supply trading setup is a foundation of technical analysis. It is derived from the fundamental economic law of demand and supply, which explains how price moves based on buyer and seller interest. When demand exceeds supply, prices tend to rise as buyers compete for limited availability. Conversely, when supply is greater than demand, prices usually fall due to excess availability. Traders use demand zones to identify potential buying areas and supply zones to locate potential selling pressure, making this setup highly effective for anticipating price reversals and trend continuation.