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A perpetuity is a financial asset that pays a fixed amount forever, and its present value can be calculated using a formula with a discount rate. It is a mathematical concept, and not a realistic view, but some genuine perpetuities exist. Calculating the present value of an annuity involves taking into account factors such as age, gender, and health. The discount rate is subjective and takes into account prevailing interest rates and the risk of payments not being made.
A perpetuity is a financial asset that will continue to pay at an agreed rate forever. It is more an economic model than a reality. The present value of a perpetual annuity can be calculated with a simple formula that provides for the payment to be made each year and a discount rate. Choosing a discount rate is somewhat subjective, meaning that calculating the present value of a perpetuity is not an objective process.
A perpetuity is a type of annuity, a financial instrument in which one party pays a fixed amount and the other party repays a fixed amount each year until the first party dies. When evaluating annuities, most analysts will actually take into account the person’s age, gender, and health to calculate the expected length of life, and then assume that this is the length of the payment. Viewing the annuity as a perpetuity is more of a mathematical concept that works on the basis that the payments will in fact last for an infinite period. This is not necessarily a realistic view, but from a mathematical perspective it reflects uncertainty. There are some genuine perpetuities such as British war bonds which cannot be redeemed for their face value but can be exchanged, and so will theoretically continue to pay an annual amount to the current holder in perpetuity.
Financial analysts will often attempt to calculate the present value of an asset paying a fixed amount. For example, the analyst may try to put a value on a bond that it will pay a certain amount each of the next 10 years. This assessment can take into account whether the person has to wait for the money, the risk of payments not being made as promised, and the return the person could have gotten by putting the money into a lower-risk investment instead. Investors and analysts can compare this valuation to the asset’s market price to see if it’s a worthwhile investment, at least on paper.
At first blush, it might seem impossible to calculate the present value of an annuity because one of the factors involved—the number of payment years—is infinity. Performing a calculation involving infinity does not normally produce a usable result. In practice, however, the rate at which the present value increases with each additional payment year slows down each year and eventually becomes so low that it is effectively worthless.
Calculating the present value of a perpetuity is therefore a simple formula: the amount to be paid each year, divided by a discount rate. The discount rate is a percentage figure that is chosen subjectively. In the context of an annuity, it will normally take into account prevailing interest rates for other investments, together with an adjustment to take into account the risk that payments will not be made as promised, for example if an annuity provider goes into liquidation. For example, if interest rates are low and the annuity provider is a national government, the discount rate will be lower, meaning the present value of the annuity is higher. This is because not only are the payouts highly likely to continue as promised, but the payouts will appear to be more profitable than other investments.
Smart Asset.
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