The construction of the daily bar chart is extremely simple. Thebar chart is both a price and a time chart. The vertical axis (the yaxis) shows a scale representing the price of the contract. The hor‑izontal axis (the x axis) records the passage of time. Dates aremarked along the bottom of the the chart. All the user has to do isplot a vertical bar in the appropriate day from the day's high to theday's low (called the range). Place a horizontal tic to the right ofthe vertical bar identifying the daily closing price. (See Figure 3.7.)The reason for placing the tic to the right of the bar is todistinguish it from the opening price, which chartists record to the left of the bar. Once that day's activity has been plotted, the user moves one day to the right to plot the next day's action. Most chart services use five day weeks. Weekends are not shown on the chart. Whenever an exchange is closed during the trading week, that day's space is left blank. The bars along the bottom of the chart measure volume.