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Sensitivity analyses show that external factors such as mean electricity price (± 200%), natural gas price (± 150%), and nominal discount rate (± 50%) have the strongest effect on NPV.
The ecological aspect was evaluated with a life cycle assessment (LCA), and the financial aspect was calculated using net present value (NPV) formulas with a nominal discount rate.
A macroeconomic evaluation using DaSOSaCa also reveals that the nominal discount rate is recommended to be greater than 20% considering the current economic situation for the renewable energy sector in Iran.
To take into account time preference, future costs were discounted at the currently recommended nominal discount rate of 3% per year[48].
All NPV calculations use a 3.5%% nominal discount rate (0.6%% real discount rate).
The nominal discount rate was chosen to mirror low current yields on 20 year UK treasury bonds (2011: 2.9 %–4.1 % p.a). (See annex A.3).
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But at current inflation levels, a one-percentage-point shift in interest rates changes the nominal cost of servicing debt — and the discount rate to be applied to future equity dividends — by up to a quarter.
In general, the discount rate is calculated as: r = i + f, where r is discount rate (nominal), i is interest rate, and f is inflation rate.
The choice of discount rate is crucial.
The discount rate was left at 6.25percentt.
Discount rate.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com