Fortunately the key insights about inflation or deflation are fairly intuitive and easy to understand. Stable prices—i.e., zero inflation—is best, fully anticipated inflation (or deflation) is second best, and inflation/deflation surprises are bad. If you would like a bit more detail, read on.
Inflation refers to the rate at which the value of money (average prices usually measure by a consumer price index—CPI) changes over time. Zero inflation, constant purchasing power of a currency over time in its local market (e.g. the value of the US dollar in the US), is best because all of the other factors impacting the supply and demand for individual goods that potentially change their prices relative to other goods and services can be expressed in terms of a constant unit account, a constant measuring rod. This makes comparing prices stated in that unit of account, especially over time, much easier. Imagine if the length or weight of something had to be expressed in units of weights and measure that themselves were always changing. Economic resources are better allocated to the satisfaction of public demand when the relative scarcity of each good and service can be clearly discerned. Decisions about the allocation of resources (whether to build a new factory to produce a new product or more of an old one and/or to hire more workers, etc.) are necessarily forward looking. The entrepreneurs’ question is what will people pay for something next year and the year after and what will it cost to produce it and how does this compare with producing something else. This is more difficult to do when the forecast of prices need to mix in the changing value of the currency in which they are stated.
However, a decent second best is a rate of inflation (positive or negative) that is steady and predictable. The inflation target of 2 percent chosen by many central banks, if reliably achieved, provides an example. If the inflation rate is fully and correctly anticipated, whether positive or negative, all other relative prices, including interest rates and wage contracts, can and will take the anticipated rate into account when setting prices in contracts for the future (e.g., a wage contract). If borrowers and lenders are willing to contract for a loan for five years at 3% per year with zero inflation in the value of the money borrowed and repaid, they would both be willing to undertake the same loan at 5% if they both expected inflation of 2% per year over those five years. If that expectation were rather uncertain, a suitable risk premium would need to be added to the interest rate. If everyone expected with certainty a 2% deflation over the same period, the loan would carry a 1% nominal rate. In both of these examples, the so-called real rate of interest—the rate adjusted for inflation—would be 3%. Thus, modest deflation does no harm if everyone fully and correctly anticipates it.
As an aside for the more advanced students, Milton Friedman explained why a fully anticipated, mild deflation was actually good because it would reduce or eliminate the opportunity cost of holding money and thus encourage people to hold larger cash balances on average without any cost to themselves or society. The money we hold in our wallets or nightstands or in our checking accounts at the bank is like any other inventory of goods that shop keepers keep on their shelves. Without an adequate inventory of what they sell, they would occasionally run out and miss some potential sales. But it cost money to hold an inventory of something. The cost can be measured by the interest you could have earned investing the money you spent to acquire the inventory (called “opportunity cost” by economists), plus any storage costs. Deflation reduces the opportunity cost of holding money by generating a real return from holding it (it is worth more in the future).
Unanticipated inflation, however, is bad because contracts written in dollar terms (so called “nominal” terms) will turn out to have a different real value than was expected. Normally a voluntary contract benefits both parties to it; it is win win. But when the inflation outcome was not anticipated, it will produce unexpected winners and losers. Debtors benefit from unanticipated inflation and creditors lose. More to the point in our current, over indebted environment, a deflation that was not anticipated when the money was borrowed, will increase the real value of the money that must be repaid. Lenders will benefit from the unexpected windfall only if borrowers actually repay their loans. But the unexpected increase in the real value of the debt being repaid may result in a larger number of defaults. So central banks are trying to avoid deflation, or more accurately are trying to achieve their inflation targets (generally 2%) in order to avoid making the economy’s excessive indebtedness even worse.
The above discussion concerns the value of a currency in its own country. But given the very extensive commerce across borders and the fact that most countries use their own currencies, cross border payments require exchanging one currency for the other. If the exchange rates of all currencies were fixed and never changed, the above analysis would apply globally as well. However, the exchange rates of many currencies, such as the USD/Euro rate, vary continuously and sometimes very significantly. The USD/Euro rate has fallen (i.e., the dollar has appreciated) 30% in the last 12 months (on April 9, 2015). This represents an enormous and very disruptive shock to the value of US trade with Europe, increasing the cost of our exports and reducing the cost of imports from Europe by very large, unpredicted amounts. Following the collapse of the gold standard, which fixed the exchange rates of most currencies, in the early 1970s, a costly financial market of insurance against exchange rate movements has developed. The total daily value of FX related transactions (spot, forwards, swaps, options) are estimated at around 4 trillion US dollars. Yes, that is daily and yes, that is trillions. These added costs of international trade would be eliminated if all or most countries returned to credibly fixed exchange rates or better still one globally used currency. The enormous gains in the standard of living from this trade could be extended even further.
The world is now “blessed” with a variety of monetary policy regimes. All of them aim in one way or another to deliver stable value for their currency either domestically or relative to another currency. The major industrial countries generally target inflation domestically and allow the exchange rates of their currency to float against other currencies. Many smaller countries fix or target the exchange rate of their currency to the US dollar or the Euro or the IMF’s Special Drawing Rights (SDR) thus causing the domestic values of their currencies to reflect the inflation rates of the currency to which they are fixed.
Two major reforms would establish a global monetary system with stable money (zero inflation). The first would be to change the IMF’s international reserve asset, the SDR, from a currency whose value is determined by a basket of key currencies (the USD, Euro, UK pound, and Japanese Yen) and allocated on the basis of political decisions, to a currency whose value is determined by a basket of real goods that is issued on the basis of market demand in accordance with currency board rules. These reforms are explained in more detail in earlier articles such as https://wcoats.wordpress.com/2010/01/21/the-u-s-dollar-and-the-sdr-as-international-reserve-currencies/ and https://wcoats.wordpress.com/2013/07/31/a-hard-anchor-for-the-dollar/. The above reforms in the SDR would include an international agreement to replace the US dollar and Euro in international pricing and payments with the reformed SDR, which I call the Real SDR. http://works.bepress.com/warren_coats/25/
The second reform would follow naturally given the greater stability of the Real SDR. Countries would fix the exchange rate of their national currencies to the Real SDR or replace them all together with the Real SDR (the equivalent of dollarization). If all or most countries did this, the world would enjoy the benefits described above of a global currency with a completely predictable and stable value relative to a “typical household consumption basket” across the globe. It is worth fighting for.
Warren's space 