Despite the Quantitative Easing (QE) policy of pumping millions of dollars into the commercial banking system, there is still no inflation in the US. Economists have suggested three causes. What are they? (multiple-answers)

Global savings glut in world markets.

Consumers are not able to take on more debt.

Commercial banks get paid interest on their reserves by the Fed.

Price disruption from fierce on-line competition keeps prices down.

The economy is experiencing shifts in aggregate supply rather than demand.