The long-run aggregate demand curve is a tool that economists use to predict growth. However, this tool can only predict the future if things stay they are the way they are right there, but we know that things change. Economies can change through government policies, like taxes, natural disasters, like hurricanes and earthquakes, and even wars. Also economies also naturally change. Some people have good days and produce a lot. Others might have bad days, and won't produce anything, or produce a negative.
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