In other words, stocks under accumulation often will rise some time after the buying begins. Alternatively, stocks under distribution will often fall some time after selling begins. It takes volume for a stock to rise but it can fall of its own weight. Rallies require the enthusiastic participation of the crowd. When a rally runs out of new participants, a stock can easily fall.
Liquid stocks are very easy for traders to buy and sell.
Stock chart analysis does not work well on illiquid stocks. Breakouts accompanied by volume much higher than the average for that stock are healthy for the continuation of the price movement in that direction. During these days, the last of the buyers or sellers take positions. The stock then reverses as there are no longer enough participants to cause price to move in that direction. Charts allow investors and traders to look at past and present price action in order to make reasonable predictions and wise choices.