The graph shows the evolution of the profits, in a scale of dollars, in time, in the scale of months.
The profit grows from month 0 to 1, decrease from month 1 to 2, and then increases from there (with stagnation in months 4, 5 and 6).
We have no information from month 7 or bigger.
The range of the profit up to month 6 is between $2,000 and $6,000, but the arrow indicate it will grow over $6,000 the following months.