that last part is something that I quite often run into in my actual job: the risk and cost of local production.
it's nice to have local manufacturers, but the reality is that quality raw materials are not always readily available and might need to be imported or come with delays at higher costs. often smaller local manufacturers can be inflexible on minimums and unreliable when it comes to meeting deadlines. inconsistent quality can lead to higher costs, more defect goods and lower output.
these are valid concerns for growing brands - same of higher production cost in, say, Portugal combined with additional import costs meet more flexibilty on minimum volumes, on-time deliveries, better product quailty, easier/more professional communication/sampling, more flexibility on re-orders, less b-grades/defect goods - this might just turn out more cost efficient than trying to keep it local.
there are lots of aspect that contribute to the overall sourcing decission and total cost.
last not least, brands might want to grow (more) in oversea markets vs. domestic market growth. a tough, saturated American market can mean a slim margin vs. a more comfortable margin in Europe or Japan/Asia.