Acordaron un precio.

It is the 3rd person plural preterite of acordar.

So it can mean:

• they agreed
• in some contexts, you all agreed (formal plural)

In this sentence, the most natural reading is they agreed on a price.

Because Spanish often leaves out subject pronouns when the verb ending already makes the subject clear.

Acordaron already tells you the subject is 3rd person plural, so ellos/ellas/ustedes is not necessary.

You might include the pronoun only for:

• emphasis
• contrast
• clarity

For example:

• Ellos acordaron un precio, pero nosotros no.

Here, acordar means to agree on, to settle, or to decide together.

So Acordaron un precio means they reached an agreement about what the price would be.

No. This is a very common point of confusion.

• acordar algo = to agree something / settle something
• acordarse de algo = to remember something

So:

• Acordaron un precio = they agreed on a price
• Se acordaron del precio = they remembered the price

Same root, different structure, different meaning.

Because in this meaning, acordar takes a direct object.

The thing that was agreed is un precio, so Spanish says:

• Acordaron un precio

In English, we usually say agree on a price, but Spanish does not need an equivalent of on here.

If you want to mention the other party, you can add con:

• Acordaron un precio con el vendedor.

Because Spanish normally uses an article with a singular countable noun in this kind of sentence.

• un precio = a price

Saying just precio here would sound incomplete or unnatural.

The preterite is used because the sentence presents the agreement as a completed action.

• Acordaron un precio = they reached an agreement

It is a finished event, not something ongoing or habitual.

Acordaban is the imperfect, so it would change the meaning.

It could suggest:

• they were agreeing on a price
• they used to agree on a price
• an action in progress or background description

By contrast:

• Acordaron un precio = they agreed on a price, completed event

Yes, in some contexts.

In Spain:

• vosotros acordasteis = you all agreed (informal)
• ustedes acordaron = you all agreed (formal)

So acordaron can refer to ustedes, but without context it is more likely to be understood as they agreed.

Roughly: a-cor-DA-ron

The stress falls on da:

• a - cor - da
  • ron

That is because the word ends in -n, and with no written accent mark, Spanish normally stresses the second-to-last syllable.

Yes, but the nuance changes.

Some similar options are:

• fijar un precio = to set a price
• decidir un precio = to decide a price
• pactar un precio = to negotiate and agree a price

Acordar un precio specifically emphasizes that the price was reached by agreement between people.

The order is:

• Acordaron = verb
• un precio = direct object

Spanish often allows flexible word order, but this is a very normal and neutral order.

You could also say:

• Ellos acordaron un precio

But the subject pronoun is usually omitted unless needed.