Monday, November 2, 2015

Review of old and new forecasts for CPI in Guam

Fairly recently, the Consumer Price Index report from the Bureau of Statistics and Plans has been released. This gives me an opportunity to review my previous simple extrapolative forecasts for third quarter 2015.

Third Quarter 2015
Actual: 116.4
1-year window: 115.4
2-year window: 115.4
3-year window: 116.5
4-year window: 116.7
5-year window: 116.9

As we see, the 1- and 2-year window forecasts were both low, and the 4- and 5-year window forecasts were a bit high, while the 3-year window was pretty close again.  Continuing with roughly the same methodology, here are my forecasts:

Fourth Quarter 2015
1-year window: 116.2
2-year window: 116.5
3-year window: 116.4
4-year window: 116.6
5-year window: 116.8

Looking at these forecasts, the 1-year is forecasting mild deflation (-0.7% annualized inflation), while the highest estimate (the 5-year window) is projecting an annualized inflation rate of 1.4%, which is pretty low. This could indicate continued demand-side weakness.

Sunday, September 20, 2015

4 reasons the Fed made the right decision (kind of, for now)

As you likely know, the Federal Reserve's Federal Open Market Committee (FOMC) made the decision on September 17 to keep the federal fund target rate unchanged at 0-0.25%. Personally, I believe this was a fairly good idea, but that the FOMC should move more aggressively to stimulate the U.S. economy.

What are the Fed's goals? There are two explicit goals: (1) maximum employment and (2) price stability. What does the Fed think is happening? From the press release:
The Committee continues to see the risks to the outlook for economic activity and the labor market as nearly balanced but is monitoring developments abroad. Inflation is anticipated to remain near its recent low level in the near term but the Committee expects inflation to rise gradually toward 2 percent over the medium term.[1]
 I will get back to the view of the Fed and how my view is different later. First, I'll give you 4 reasons that the Fed made the right decision not to increase the Target Federal Funds Rate.

Thursday, August 6, 2015

Simple forecasts of employment

Relatively recently, a Current Employment Report has been released, 1st Quarter of 2015. In February, I made a forecast of 1st Quarter 2015 headline employment. The forecast amount was 63,010. Headline employment for the period was 62,760, which means the forecast was within my margin of error of 1,050 (95% confidence). To reflect, my forecasts of the average hourly private sector wage, employment, and CPI were all overstated. The employment forecast was not so bad, but I'd like to compare it to a naive forecasting methodology (rolling average annual rates of increase for windows of different periods of years):

Actual: 62,760
VAR forecast: 63,010 (+250)
1-year window: 62,210 (-550)
2-year window: 62,320 (-440)
3-year window: 62,450 (-310)
4-year window: 62,300 (-460)
5-year window: 62,390 (-370)

Comparatively, this one period shows a better performance for the VAR. Nevertheless, for now, consider the following forecasts for 2nd Quarter 2015 (which has already past, but is not published yet, so still unknown):

1-year window: 62,920 (+160 jobs)
2-year window: 62,730 (-30 jobs)
3-year window: 62,450 (+80 jobs)
4-year window: 62,300 (-10 jobs)
5-year window: 62,720 (-40 jobs)

If these forecasts are to be believed, there will probably be little change in headline employment between March and June 2015. A major drawback to this form of forecasting is that, since it is based on lagged rates of change, once a growth trend ends, the forecast will be thrown off. If all one uses is a simple extrapolative technique, then even a rate of change which should be able to be anticipated because of known or suspected (perhaps by some type of model with structural variables) relationships between available data would not be accounted for.

In the future, I will probably add back a VAR model to forecast a number of variables together, but some simplified technique would probably be worthwhile, just to consider an alternative benchmark.

Saturday, July 4, 2015

Forecast of CPI for third quarter 2015

It has been a while since I made a forecast or reflected on the results of my prior forecasts. I have reviewed my most recent forecast for CPI for first quarter 2015 and it is far from perfect. For one thing, CPI fell by 1.6% from 117.9 in fourth quarter 2014 to 116.0 in first quarter 2015. This is in stark contrast with my projected increase of 0.6% to 118.6 in first quarter 2015. Looking across several simple forecasting methods (taking the historical average growth rate of CPI with rolling 1, 2, 3, 4, and 5 year windows), I have determined that each of these methods yielded similar results to my three-variable vector autoregression:

Actual: 116.0 (decrease of 1.6%)
1-year window: 118.4
2-year window: 118.1
3-year window: 118.1
4-year window: 118.4
5-year window: 118.5

Going forward one period to the next period for my simple extrapolating forecast methods, consider the following results:

Actual: 116.5 (increase of 0.4%)
1-year window: 115.9
2-year window: 115.9
3-year window: 116.0
4-year window: 116.4
5-year window: 116.4

The method with the lowest Mean Absolute Percentage Error between the uniform start period for the forecasts (2001 quarter 4) was the 5-year window. I still want to further refine my use of different forecasting methods, but I can at least keep this simple method in reserve, to look at alongside forecasts from a more advanced technique.

For third quarter of 2015, here are the forecasts:

1-year window: 115.4
2-year window: 115.4
3-year window: 116.5
4-year window: 116.7
5-year window: 116.9

I will try to keep up with the reports as they come out and compare my forecasts against them in the future.

Wednesday, May 27, 2015

Government bonds and borrowing

In my previous post "What is fiscal policy?", I laid out a brief explanation of what fiscal policy is and mentioned that deficit/debt financing allows a government to make current expenditures with the commitment to pay back expenditures in the future. Often, a government resorts to issuing a bond rather than a loan from a bank. A bond is basically just a loan which is to be paid to the holders of a security.

From the point of view of individuals, the bond is a security that one can buy which will yield payment(s) in the future. The demand for the bond once it is issued is determined by the rate of interest that investors require given their perception of the risk that the issuer will not repay the bond as agreed. This will be reflected in the market price of the bond which, in turn, determines its interest rate. Consider the following simple example. A government has a number of capital improvement projects that it wishes to fund with borrowing. Rather than borrowing a specific amount, policymakers decide that they are reasonably certain about their ability to pay back an amount the next year, so the government issues a 1-year zero-coupon (aka, discount) bond in the amount of $50 million.[1] Given the risk profile of the government, investors are willing to lend at an annual interest rate of 5%. Here is the equation for a 1-year maturity discount bond:

Thus, at 5%, the Current Price which would be offered in the market would be about $47.6 million for the payment of $50 million in 1 year. If the market interest rate were instead 10%, the Current Price would be about $45.5 million. It is not hard to see that this is identical to the case where a $45.5 million 1 year maturity bond is issued, investors are willing to lend at 10% interest and the ultimate amount to be paid in 1 year is $50 million.

There are several different types of bonds, but one thing to keep in mind is that the price of the bond is going to be inversely related with its rate of interest. If individuals become more willing to invest in a given bond, the interest rate will decline.

There are constraints to how much debt a country can issue. One is whatever restraints are put on the issuance of debt, for example, there are formal debt limits that are set by constitutional provisions or the laws of a jurisdiction. In Guam, it is 10% of the aggregate real property valuation, which is expected to rise considerably soon.

A second consideration is the total debt that the market will bear. As total debt rises, investors will tend to view the ability or willingness of a government to pay for the additional debt with increasing skepticism, which will eventually translate into rising interest rates, generally.  This will raise the burden of interest payments and make it harder for a government to service additional debt.

A third consideration is the technical sustainability of government debt.  In the long run, individuals generally need to make means and ends meet (i.e., the present discounted value of lifetime expenditures should equal the present discounted value of lifetime revenue). A  crucial difference between an individual's ability to pay and the government's is that a government is presumed to be a permanent institution. The definition of solvency for a government, then, is that the present value of revenues should equal or exceed the present value of expenditures. What this means is that taking together current revenues and future revenues, properly discounted at a given rate of interest, would need to equal or exceed the current expenditures and future expenditures, properly discounted at a given rate of interest.[2]

These, however, are constraints, not definitions of the optimal public policy with regard to the accumulation of debt. Some may argue the desirability of targeting a nominal amount of debt, a real amount of debt (discounted by the price level), or a debt-to-output ratio, as I discussed briefly in the previous post. I am personally inclined to favor targeting a long-run debt-to-output ratio.

[1] As a practical matter, the amount raised can be determined, but could not be known for certain well before the issuance.
[2] Just to clarify the issue a little for those mathematically inclined, but unfamiliar with the concept of present value, here's an expression of present value for a current value at time "t":

Wednesday, April 29, 2015

What is fiscal policy

If I were to guess, I'd suggest that when most people hear the words fiscal policy, they would think of the government's taxing, spending, and borrowing. In economics, the words have a broader meaning. Upon reflection, I would say that fiscal policies are the choices that the government collectively makes with regard to the use of purchasing power and the means by which such purchasing power is obtained. When putting this definition together, I had in my mind the need to encompass the following: purchases of goods and services, employment and retirement of government workers, transfer policies, taxes, fees, intergovernmental transfers, borrowing, and helicopter money.


The uses of puchasing power are fairly straightforward. The two main categories are transfer payments and providing goods or services. Transfer payments are simply distribution of purchasing power to a set of individuals. The best known policy of this nature is social security, which distributes money to the disabled and senior citizens. Providing goods and services involve a combination of buying goods and services from businesses and employing government workers (which also means providing for their retirement).


There are fundamentally two ways to pay for the government's use of purchasing power: taxation and printing money. The primary way is through taxation (whether through "taxes" or "fees").

A major issue in finance is when this taxation will occur. The typical "balanced budget" approach is for the government to pay for all expenditures in a period by raising an equal amount of revenue in the same period. The alternative "deficit/debt financing" approach is for the government to borrow in the current period and promise to repay lenders in the future. This latter option can employ loans or a bond, but the principle is the same (I'm ignoring the possibility of printing money, for simplicity and because nobody seriously suggests that as a sustained source of revenue).

There are two main ideas of how to conduct fiscal policies in the long run. One is to maintain a given level of nominal debt (i.e., revenues and expenditures are equal), the other is generally to maintain a stable debt-to-gdp ratio (nominal debt grows only as fast as nominal output). Think of it this way: policy may be aiming at lowering (for instance) nominal debt or the debt-to-gdp level, but there is generally a level that is going to be targeted in the long-run (even if that level is zero).

According to old keynesian and neowicksellian/new keynesian models, fiscal policy can stimulate an economy with less than full employment of productive factors (labor and capital).

Tuesday, February 24, 2015

Forecast of Guam Variables for Calendar Year 2015 First Quarter

Recently, the Current Employment Report has come out with less than stellar performance for the last quarter of 2014.  Total employment declined.  My first forecast was not as accurate as I would have liked.  In retrospect, I used too many lags of data in my VAR and univariate models.  Furthermore, I was working to reduce the root mean squared error a bit too hard.  This time, I have one model, with three (kinda four) variables.  I am, once again, employing a Vector Autoregression.  My variables are:

Acceleration of (d^2) CPI inflation,
Acceleration of (d^2) Hourly wage inflation, and
Change (d) in Employment relative to the change.

After adjusting to the figures published for CPI, Average Hourly Private Sector Wage (AHW), and Total Employment (Emp), I have the following forecast results:

2015, 1st Quarter:
CPI:       118.6    (~2)
AHW:    13.30   (~0.37)
Emp:      63,010 (~1,050)

In the future, I'd like to try to tighten up my one point ahead forecasts, perhaps by combining multiple methods of estimation.