This is more complicated than you may think. For example, if you live in the USA, how do you estimate the dollar's fall in value over the next 10 to 20 years?
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Also, here in the USA, our government (for very good reasons) underestimates inflation. In the last decade, stuff like the cost of food, medical expenses, and housing have been removed or diminished in the inflation rate calculations. Stuff like the drop in consumer electronics is factored into this calculation with a strong weighting factor.