The Advancing-Declining Volume Line (AD Volume Line) is a breadth indicator based on Net Advancing Volume, which is the volume of advancing stocks less the volume of declining stocks. Net Advancing Volume is positive when advancing volume exceeds declining volume and negative when declining volume exceeds advancing volume. The AD Volume Line is a cumulative measure of Net Advancing Volume. It rises when Net Advancing Volume is positive and falls when Net Advancing Volume is negative. Chartists plot the AD Volume Line for a specific index and compare it to the performance of that index. The AD Volume Line should confirm an advance or a decline with similar movements. Bullish or bearish divergences in the AD Volume Line signal a change in buying or selling pressure that could foreshadow a reversal in the index.