[distances]

I don't know about Argentina specifically, but in many countries unions negotiate salary raise percentages for the whole sector. If the country follows universal collective bargaining, this may also be a binding minimum raise for non-unionized employees in the same sector, even in companies that aren't members of the trade union that bargained the deal.

[jfroma]

Argentinian here, I confirm that it works exactly was you described, even the non-unionized part.