(Bloomberg) A tug-of-war is developing between investors and policymakers in emerging economies: markets keep dumping assets on concerns of growing risks, prompting authorities to wade in with one-off support measures aimed at stemming the selloff.Most Read from BloombergRussia Calls Emergency Key Rate Meeting as Ruble PlungesHollywood Studios Offer Writers a New Deal With Push From Netflix, Iger to End StrikeTrump Fourth Indictment Lays Out Sweeping Georgia Election PlotOut of Options and Mo