Use the visual cash-balance chart for a service venture with delayed sales. Text exhibit: line graph titled Cash Balance Without Early Sales. X-axis labels: Launch, End Month 1, End Month 2. Y-axis: cash balance in dollars from $0 to $700. Plot one line named Two-month reserve with points Launch $600, End Month 1 $300, End Month 2 $0. Add a note below graph: Monthly operating costs are $300; sales begin after month 2. Use clear axis labels and point labels. What is the main budget lesson?