Learn Portuguese (Portugal): Temos de adquirir a empresa, uma vez que o mercado é competitivo. - We have to acquire the company, since the market is competitive.

While both introduce a cause, uma vez que translates closer to "since" or "given that". It is an argumentative connector, meaning it is used to justify a conclusion (acquiring the company) based on an established premise (the competitive market). It also sounds more formal and professional than porque.

Does the phrase uma vez que trigger the subjunctive mood?

No, it takes the indicative mood. Because it introduces a stated fact or an accepted reality to build an argument, you use the standard indicative. This is why the sentence uses é rather than the subjunctive seja.

Could we put the uma vez que clause at the very beginning of the sentence?

Yes, absolutely. You can say: Uma vez que o mercado é competitivo, temos de adquirir a empresa. In European Portuguese, starting a sentence with porque is generally avoided in formal writing, so uma vez que (or como) is the standard choice when you want to state the cause before the main action.

As a quick refresher, why does this sentence use temos de instead of temos que?

In European Portuguese, ter de is the grammatically precise way to express a strong obligation ("have to"). While you will sometimes hear ter que in casual everyday speech, ter de is heavily preferred in writing and professional contexts like this one.