<p>On-Balance <a href="/NewSite/encyclopedia/volume/" class="ency-link">Volume</a> (OBV) is a technical analysis indicator that uses volume flow to measure buying and selling pressure as a means of predicting changes in a stock's price. It was developed by Joseph Granville in the late 1960s and is considered an intermediate-level indicator, suitable for traders with some experience in technical analysis.</p>

<h2>How It Works</h2>
<p>OBV is calculated by multiplying the daily volume by the direction of the price change. If the price is up, the volume is added to a cumulative total. If the price is down, the volume is subtracted from the cumulative total. If the price is unchanged, the volume is ignored. The result is a running total of positive and negative volume, which can be plotted as a line below the price chart.</p>
<p>To interpret OBV, traders look for divergences between the OBV line and the price action. A bullish divergence occurs when the OBV line makes higher highs while the price makes lower highs, indicating that selling pressure is decreasing. A bearish divergence occurs when the OBV line makes lower lows while the price makes higher lows, indicating that buying pressure is decreasing.</p>

<h2>Why It Matters</h2>
<p>OBV is a useful tool for confirming trends and identifying potential reversals. When used in conjunction with other technical indicators, it can help traders make more informed decisions about when to enter or exit trades. For example, a bullish OBV divergence combined with a bullish candlestick pattern could signal a potential buy opportunity, while a bearish OBV divergence combined with a bearish candlestick pattern could signal a potential sell opportunity.</p>
<p>However, it's important to note that OBV is a lagging indicator, meaning it reflects past volume rather than predicting future volume. As such, it should not be used in isolation but rather as part of a broader technical analysis strategy. Additionally, OBV is more effective in identifying trends than in predicting reversals, so it's best used in trending markets.</p>