What is the difference between linear and logarithmic scale?
When you select the Linear chart option, you will view a chart whose vertical axis shows an equal distance along the axis for each absolute change in price. In other words, a stock that has moved from $20 to $30 would show the same absolute change as an increase in price from $50 to $60, even though the move from $20 to $30 represented a 50% advance, whereas the move from $50 to $60 represented a more modest 20% advance. Conversely, if you select the Logarithmic (“Log”) chart option, you will view a chart whose vertical axis is structured so that an equal distance along it represents an equal percentage change. The move from $20 to $30 is a larger percentage increase (50% increase) than the move from $50 to $60 (20% increase). Therefore, the axis points between $20 and $30 are farther apart than the axis points between $50 and $60.
