The lead-zinc concentrate processed in Trepca, in Serbia's tense province of Kosovo, comes in through Bar, along with an array of Serbia's other essential imports including iron ore and coal.

ECONOMIST: Montenegro

Mr. Page, the company's chief executive, said recently that focusing on competitors can lead companies to "decay" because they concentrate on incremental improvement rather than big, risky bets that can offer a bigger payout.

WSJ: Google Follows Amazon's Lead on New Shopping Site, Delivery, Other Services