Add concepts with relation to monetary values

[han-f]

Description of the issue

While we discussed at Öko about parameters typically used for projecting scenarios we came across two metrics that are related to expressing monetary values (typically GDP, energy prices) and that may be worthwhile having in the oeo.

1. constant price
2. real growth rate

-> "corrects" for inflation

Since monetary values can also be measured according to nominal values, potentially we may also discuss whether we may need

3. nominal price
4. nominal growth rate

-> does not "correct" for inflation

Ideas of solution

If you already have ideas for the solution describe them here

Workflow checklist

• I discussed the issue with someone else than me before working on a solution
• I already read the latest version of the workflow for this repository
• The goal of this ontology is clear to me

I am aware that

• every entry in the ontology should have a definition
• classes should arise from concepts rather than from words

[l-emele]

So the concepts of constant prices and nominal prices apply to everything that has as unit currency or a composed unit with a currency as part of the unit (e.g. for the latter: €/MW, $/GJ).

And the concepts of real growth rate and nominal growth rate apply to concepts that are ratios like inflation rate and GDP growth?

Do you agree to this this?

[han-f]

Yes.

[l-emele]

So the concepts of constant prices and nominal prices apply to everything that has as unit currency or a composed unit with a currency as part of the unit (e.g. for the latter: €/MW, $/GJ).

So basically, it is a quality of a quantity.

[l-emele]

I close this issue as we have a very similar issue #1585 and it makes sense to discuss in one issue only.