In teenstelling met vervreemders betaal kopers kooppryse.

Yes. In teenstelling met is a fixed expression meaning in contrast to, unlike, or as opposed to.

It is best to learn it as one chunk:

• in teenstelling met kopers
• in teenstelling met die wet
• in teenstelling met verlede jaar

The met is part of the expression, so you normally keep it.

In a simple statement, yes, the subject often comes first:

• Kopers betaal kooppryse.

But Afrikaans follows the verb-second rule in main clauses. That means the finite verb must come in the second position.

So when the sentence starts with In teenstelling met vervreemders, that whole phrase takes the first position. The verb betaal must then come second, and the subject kopers comes after it:

• In teenstelling met vervreemders betaal kopers kooppryse.

This is very normal Afrikaans word order.

Because the sentence is talking about these groups in a general way, not about specific ones.

Afrikaans often leaves out the article in general statements:

• Kopers betaal kooppryse.
• Studente skryf eksamens.
• Honde blaf.

If you meant specific buyers or specific sellers, you could use die:

• In teenstelling met die vervreemders betaal die kopers die kooppryse.

That would sound more like you are referring to particular people and particular prices already known from the context.

Vervreemders is the plural of vervreemder.

This is a fairly formal or legal word. It comes from vervreem, which can mean to alienate, to transfer, or in some contexts to estrange. In property or legal language, vervreemder can mean someone who transfers or disposes of property, often effectively the seller or transferor.

So a learner should know that this is not the most everyday word for seller. In ordinary speech, verkopers is often more common.

Because they are plural nouns.

• vervreemder → vervreemders
• koper → kopers

Many Afrikaans nouns ending in -er form the plural with -s. These are often words for people:

• werker → werkers
• onderwyser → onderwysers
• bestuurder → bestuurders

So this plural pattern is very common and worth remembering.

Kooppryse is a compound noun:

• koop = purchase / buy
• pryse = prices

So kooppryse means purchase prices.

Afrikaans, like Dutch and German, often writes compound nouns as one word. That is why you get:

• koopprys = purchase price
• kooppryse = purchase prices

This is completely normal in Afrikaans.

The singular is koopprys.

The plural is kooppryse.

In this sentence, the plural is used because the statement is general: buyers, as a class, pay purchase prices, not just one single purchase price. English often works the same way in broad statements.

A useful thing to notice is that in compounds, the last part usually determines the plural:

• prys → pryse
• therefore koopprys → kooppryse

Yes, you could say Kopers betaal kooppryse.

That version is a straightforward statement:

• Buyers pay purchase prices.

The original sentence begins with In teenstelling met vervreemders in order to emphasize the contrast:

• In contrast to alienators/sellers, buyers pay purchase prices.

So the difference is mainly one of focus and emphasis:

• Kopers betaal kooppryse = neutral statement
• In teenstelling met vervreemders betaal kopers kooppryse = contrast is highlighted first

That kind of fronting is very common in Afrikaans.