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A line chart is a line on a chart that displays security prices over time. A line chart represents the price — usually, the closing price — of a security from one period to the next.

On a very short-term basis, a line chart is definitely a proper choice for decision making. Because no other information is displayed, however, attempting to formulate any sort of trading strategy from a line chart of price action wouldn’t be a worthwhile venture.

Figure 2-5 is a line chart showing three months of daily closing prices for a stock.

FIGURE 2-5: A line chart.