1、Quantitative easing may cause higher inflation than desired if the amount of easing required is overestimated, and too much money is created. On the other hand, it can fail if banks remain reluctant to lend money to small business and households in order to spur demand. Quantitative easing can effectively ease the process of deleveraging as it lowers yields. But in the context of a global economy, lower interest rates may contribute to asset bubbles in other economies.
2、An increase in money supply has an inflationary effect (as indicated by an increase in the annual rate of inflation). There is a time lag between money growth and inflation, inflationary pressures associated with money growth from QE could build before the central bank acts to counter them. Inflationary risks are mitigated if the system's economy outgrows the pace of the increase of the money supply from the easing. If production in an economy increases because of the increased money supply, the value of a unit of currency may also increase, even though there is more currency available.
3、For example, if a nation's economy were to spur a significant increase in output at a rate at least as high as the amount of debt monetized, the inflationary pressures would be equalized. This can only happen if member banks actually lend the excess money out instead of hoarding the extra cash. During times of high economic output, the central bank always has the option of restoring the reserves back to higher levels through raising of interest rates or other means, effectively reversing the easing steps taken.
4、On the other hand, in economies when the monetary demand is highly inelastic with respect to interest rates, or interest rates are close to zero (symptoms which imply a liquidity trap), quantitative easing can be implemented in order to further boost monetary supply, and assuming that the economy is well below potential (inside the production possibilities frontier), the inflationary effect would not be present at all, or in a much smaller proportion.
5、Increasing the money supply tends to depreciate a country's exchange rates versus other currencies. This feature of QE directly benefits exporters residing in the country performing QE and also debtors whose debts are denominated in that currency, for as the currency devalues so does the debt. However, it directly harms creditors and holders of the currency as the real value of their holdings decrease. Devaluation of a currency also directly harms importers as the cost of imported goods is inflated by the devaluation of the currency.
6、The new money could be used by the banks to invest in emerging markets, commodity-based economies, commodities themselves and non-local opportunities rather than to lend to local businesses that are having difficulty getting loans.