At that restaurant, she earns a salary of USD 25,000 per year. ![]() Thus, to find the change in income, all we have to do is subtract Y 0 from Y 1.įor example, let’s say you have a friend called Emily, who works at a restaurant as a waitress. That means the change in income describes the change in the level of income between a certain point in the past (Y 0) and a more recent point in time (Y 1). Note that the Δ sign is the Greek letter delta, which is commonly used as a mathematical symbol for a difference between two values. ![]() First, we have to find the change in income (ΔY).
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