Jo høyere spotprisen blir, desto billigere virker fastprisen.

It is a very common Norwegian pattern for expressing a linked comparison:

• Jo høyere ..., desto billigere ...
• The higher ..., the cheaper ...

So this structure means that when one thing changes in one direction, another thing changes in a corresponding way.

A few more examples:

• Jo mer du øver, desto bedre blir du.
  The more you practise, the better you get.
• Jo tidligere vi drar, desto bedre.
  The earlier we leave, the better.

In everyday Norwegian, this is a standard way to say the more..., the more..., the higher..., the lower..., and so on.

It is the same written word, but not the same function.

Norwegian jo can do different jobs depending on context:

• as a reply particle: Jo! = Yes (especially to contradict a negative statement)
• as an emphasis particle: Det vet du jo. = You do know that
• in this sentence, as part of the fixed comparative pattern jo ..., desto ...

So here, jo is not being used for emphasis or contradiction. It is simply part of the grammar pattern meaning the more/the higher...

Because they are the comparative forms of the adjectives:

• høy → høyere = high → higher
• billig → billigere = cheap → cheaper

This sentence compares degrees:

• jo høyere spotprisen blir = the higher the spot price gets
• desto billigere virker fastprisen = the cheaper the fixed price seems

A useful thing to remember is that comparative adjectives in Norwegian usually do not change for gender or number. So you use høyere and billigere regardless of whether the noun is masculine, feminine, neuter, or plural.

Because they are in the definite singular form:

• en spotpris = a spot price

• spotprisen = the spot price

• en fastpris = a fixed price
• fastprisen = the fixed price

Norwegian usually marks definiteness by adding the article to the end of the noun.

These are also compound nouns, which Norwegian uses a lot:

• spotpris = spot
  • pris
• fastpris = fast
  • pris

Then the definite ending is added to the whole compound:

• spotpris
  • -en = spotprisen
• fastpris
  • -en = fastprisen

Because Norwegian often puts the definite article at the end of the noun instead of using a separate word before it.

So:

• spotprisen already means the spot price
• fastprisen already means the fixed price

You only add a separate definite word such as den in certain cases, especially when an adjective comes before the noun:

• prisen = the price
• den faste prisen = the fixed price

But in your sentence, the nouns appear on their own, so the ending -en is enough.

Because the two verbs express different ideas:

• blir = becomes / gets
• virker = seems / appears

So:

• spotprisen blir høyere = the spot price gets higher
• fastprisen virker billigere = the fixed price seems cheaper

This is an important nuance. The sentence does not say that the fixed price actually changes. It says that it appears cheaper when the spot price rises.

So the logic is:

• the spot price rises
• because of that, the fixed price looks more attractive or cheaper by comparison

Because Norwegian main clauses follow the V2 rule: the finite verb usually comes in the second position.

In the second clause, desto billigere is placed first. That means the verb must come next:

• Desto billigere virker fastprisen.

Breakdown:

1. Desto billigere = first position
2. virker = finite verb in second position
3. fastprisen = subject after the verb

This kind of inversion is very normal in Norwegian whenever something other than the subject comes first.

Compare:

• Fastprisen virker billigere.
• I dag virker fastprisen billigere.
• Desto billigere virker fastprisen.

In all of these, the finite verb stays in second position.

Because the jo clause in this pattern behaves differently from an ordinary main clause.

In this construction, the usual pattern is:

• Jo + comparative + subject + verb

So:

• Jo høyere spotprisen blir
• Jo mer du leser
• Jo eldre han blir

This is the normal, idiomatic shape of the structure. It is best learned as a fixed pattern rather than by trying to force regular main-clause word order onto it.

A good model to remember is:

• Jo + comparative + noun/pronoun + verb, desto/jo + comparative + verb + noun/pronoun

Yes, very often you can.

Both of these are possible in Norwegian:

• Jo høyere spotprisen blir, desto billigere virker fastprisen.
• Jo høyere spotprisen blir, jo billigere virker fastprisen.

The version with desto can sound a bit more formal or written, but it is completely normal. The version with jo ... jo ... is also very common, especially in everyday speech.

So as a learner, it is useful to understand both patterns.

The comma separates the two linked parts of the comparison:

• Jo høyere spotprisen blir,
• desto billigere virker fastprisen.

This makes the structure easier to read and is the normal way to write this kind of sentence.

You can think of it as dividing:

• the condition or changing factor
• the result or corresponding effect

So the comma is not random punctuation; it helps show the relationship between the two halves.

They are normal Norwegian-style compound nouns, but they are especially common in contexts like electricity pricing, contracts, and markets.

• spotpris = spot price, market-based price
• fastpris = fixed price

Norwegian forms words very freely by combining smaller words into compounds, so this is a pattern you will see everywhere. For example:

• bilpris = car price
• strømpris = electricity price
• fastlønn = fixed salary
• fasttelefon = landline phone

So even if these specific words are used a lot in certain topics, the way they are built is completely normal Norwegian.