First, I would like to thank Martin for drawing our attention to the correct definition of inflation. The confusion among the public and experts alike has serious consequences for economic policy and behavior.
Inflation indeed is a monetary phenomenon caused by an increase in the money supply. However, I don’t believe Martin goes far enough to explain exactly what this means and the impact on monetary policy.First, price increases do not cause inflation. This confuses cause with effect. Inflation (again, the increase in the money supply) causes price increases. Moreover, a one time jump in commodity prices may indeed signal inflationary pressures caused by a one time increase in the money supply, though we would then expect to see a medium to long run increase in the price of all goods.
On the other hand, a sustained change in the relative prices of goods is not inflation, but is caused by an underlying change in the supply or demand for specific goods. Reduced coffee production with unchanged world demand will result in an increase in the price of coffee relative to other goods.
While I agree with Martin that many emerging economies such as China have kept the value of their currencies low versus the dollar in order to increase exports, I disagree that the resulting trade deficit causes a decrease in U.S. domestic output. First, as some goods may be purchased by U.S. consumers from Chinese producers at a lower price than their domestic counterparts, consumers save money. This in turn frees up money to purchase other goods that may be produced domestically or to invest in new business opportunities, the result being (in the medium to long run) that new U.S. businesses will crop up and grow in the U.S. Simply, the U.S. gains from China’s inflationary policies while the Chinese consumer suffers.
As far as monetary policy, an increase in interest rates will have little to no benefit for consumers in regards to relative price changes, as the price of all goods, and hence incomes, will decrease. It will, however, curb the growth of the money supply and thus reduce inflation if it exists.
This leaves us with a conundrum: how do central banks know if an increase in prices is due to inflation or changes in supply and demand, given that both may occur at the same time? Simply, they don’t. Hence the extreme difficulty (and perhaps folly) of manipulating interest rates to control prices.
Justin D. Rietz
BA, Economics, Stanford University
MBA, UC Berkeley Haas School of Business
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