The Fed is caught between a rock and a hard place. If they inflate, they risk the danger of initiating a damaging and deleterious trade war with creditors who do not want to take an inflationary haircut. If they don’t inflate, they remain stuck in a deleveraging trap resulting in weak fundamentals, and large increases in government debt, also rattling creditors. The likeliest route from here remains that the Fed will continue to baffle the Krugmanites by pursuing relatively restrained inflationism (i.e. Operation Twist, restrained QE, no NGDP targeting, no debt jubilee, etc) to keep the economy ticking along while minimising creditor irritation. The problem with this is that the economy remains caught in the deleveraging trap. And while the economy is depressed tax revenues remain depressed, meaning that deficits will grow, further irritating creditors (who unlike bond-flipping hedge funds must eat the very low yields instead of passing off treasuries to a greater fool for a profit), who may pursue trade war and currency war strategies and gradually (or suddenly) desert US treasuries and dollars. Geopolitical tension would spike commodity prices. And as more dollars end up back in the United States (there are currently $5+ trillion floating around Asia), there will be more inflation still. The reduced global demand for dollar-denominated assets would put pressure on the Fed to print to buy more treasuries.