Archive for the 'Trade-offs' Category

Sep 11 2008

Rational behavior, opportunity cost, marginal analysis - An intro to the Economic way of thinking

Freakonomics - Laid-Back Labor - New York Times

If you’ve spent much time on this blog, you know that I’m a fan of the boys at Freakonomics, the book that so aptly applies economic theory to the seemingly benign happenings of everyday life. In the article above the Freakonomists examine the difference between labor and leisure. I thought this article did a good job of introducing some of the basic concepts behind how economists think about the world.

As this year’s AP students begin to delve into the world of economics, one of the early topics they study will be the concept of humans as rational beings engaged in the constant pursuit of utility (the economist’s word for happiness). According to our text, “Economics assumes that human behavior reflects ‘rational self-interest.’ Individuals look for and pursue opportunities to increase their utility.”

If, as economists say, the purpose of life it the pursuit of utility, then presumably work is only a tedious but necessary means to an end, which we assume to be leisure. So why, as pointed out in the article above, do so many people willingly choose to spend so much time and money doing things like cooking, knitting, gardening, working in the yard, and other tasks that appear to be work, when they could easily pay others to do these menial chores for them, thus giving them more time for leisure? As the authors say, “Isn’t it puzzling that so many middle-aged Americans are spending so much of their time and money performing menial labors when they don’t have to?”

Where exists the line between work and leisure? This seems like an apt question to explore from an economic perspective. Here’s the author’s view:

“Economists have been trying for decades to measure how much leisure time people have and how they spend it, but there has been precious little consensus. This is in part because it’s hard to say what constitutes leisure and in part because measurements of leisure over the years have not been very consistent.http://www.rideau-info.com/canal/images/locks/mowing.jpg

Economists typically separate our daily activities into three categories: market work (which produces income), home production (unpaid chores) and pure leisure. How, then, are we to categorize knitting, gardening and cooking? While preparing meals at home can certainly be much cheaper than dining out and therefore viewed as home production, what about the ‘cooking for fun’ factor?”

Why a professional (let’s say a lawyer) who spends 50 hours a week in his office, earning somewhere in the range of $100 an hour for his labor, would choose to spend two hours mowing his lawn on a Saturday, rather than hiring the neighbor boy to do it for him, truly poses an economic paradox.

Let’s see why: If this man’s labor is worth $100 and hour, then we can calculate the opportunity cost of mowing his own lawn as $200 plus the value to this man of the leisure he could have enjoyed by not mowing his lawn. The man probably could have hired the neighbor boy to mow his lawn for $20, which would have then freed him up to pursue his own leisure activities (reading, working out, watching a movie, etc.) during those two hours, and compared to the $200 value of his own labor the $20 seems like a bargain. So is a lawyer who mows his own lawn acting irrationally?

It would seem the line separating leisure from work has blurred in modern times. A hundred years ago an activity such as sewing or caring for a lawn would certainly have been viewed as work, but today the behavior of millions of Americans would indicate otherwise. As a science rooted in the belief that humans are rational pursuers of their own happiness and leisure, the paradox of the lawn mowing lawyer poses several interesting questions for students of economics.

Discussion Questions:

According to chapter one of our text (McConnell and Brue’s Economics, 17th Edition), “Purposeful (rational) behavior does not assume that people and institutions are immune from faulty logic and therefore are perfect decision makers. They sometimes make mistakes.”

  1. Is the lawyer who mows his own lawn defying a fundamental rule of economics, that people act rationally? Is he making a mistake by not hiring the neighbor boy to do it for him?
  2. What is meant by opportunity cost? Give an example of a decision you have made recently that involved an opportunity cost.
  3. How is the lawyer’s decision whether or not to mow his lawn rooted in marginal analysis? Describe a choice you’ve made recently that involved marginal analysis.

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May 26 2008

It may not be a recession, but it sure feels like one…

FT.com / Columnists / Wolfgang Munchau - Inflation and the lessons of the 1970s

It seem that everyone’s speculating about the US economy today. Recession or no recession, that is the question. The economy has even surpassed the Iraq War as the number one issue in the US presidential race! John McCain, who has publicly admitted that economics is not his strong suit, may just find himself in trouble in a general election where the most important concern among voters is the economic situation.

So what IS that situation, anyway? Is the US in a recession? In other words, has real gross domestic, or total output in the US economy, actually declined over the last six months? Technically, the answer is no. My fellow blogger, Steve Latter, explains this clearly here. What is true, on the other hand, is that the current situation shares many similarities to the global economic slowdown that did occur in the 1970s.

In 1973 OPEC, the newly formed oil cartel consisting at the time of only Arab states, reduced its output of oil and cut off exports to the United States in response to US support of Israel in the Yom Kippur War, in which the Israelis officially occupied the Palestinian territories of the West Bank and Gaza and seized the Golan Heights from the sovereign nation of Syria. To punish the US for its position on this conflict, OPEC cut off supplies of oil to the west, driving gas and energy prices upwards by 70%, triggering a supply shock characterized by a decline in total output and an increase in both unemployment and inflation, a phenomenon known as stagflation: a macroeconomic policy maker’s worst nightmare.

Recently the world has seen a similar (albeit of a different cause) rise in the price of oil and energy prices. Today the rise in energy prices is driven primarily by rising demand, rather than reduced supply (since the 1970s the OPEC cartel has grown to include many non-Arab nations, making it harder to achieve collusion to restrict output and drive up oil prices). Global demand for oil has risen steadily, driven ever higher due to rapid growth in China and other developing nations, and exacerbated by the falling value of the dollar, the currency in which oil prices are denominated.

The supply shocks of today have combined with falling aggregate demand in the US due to weak consumer spending to slow real growth rates to nearlry 0%. So technically, the US has avoided a recession, but the effect on American workers and consumers may be just as painful as the real recession of the 1970s. In order to prevent the “r” word from becoming a reality today, central banks (including the US Fed) have eased money supplies, lowering interest rates, fueling even greater increases in the price level.

…the global weighted average inflation rate will be 5.4 per cent this year, while the global money market interest rate is currently only 4.3 per cent. This means that global short-term real interest rates are negative – at a time when inflation is rapidly accelerating. As monetary policy has been excessively accommodating for more than a decade, inflationary pressures have built up in the global economy.

Central bankers like Ben Bernanke have to make tough decisions sometimes, weighing the trade-off between unemployment and inflation, and determining their monetary policies based on whatever they deem to be the “lesser of two evils”. Rising energy prices have forced firms to cut either cut back their production and raise the price of their products, both actions that result in less overall spending and output in the economy. Falling house prices have led consumers to cut back their own spending, further reducing demand for firms’ output. These factors have all pushed the unemployment rate from around 4.8% a year ago to 5.1% today, which combined with an estimated additional 3-5% of American workers having dropped out of the workforce, (referred to by the Department of Labor as “discouraged workers”) paints a pretty ugly picture of the reality for the American worker today.

The harsh reality of the weak labor market has led Mr. Bernanke and the Fed to pursue an expansionary monetary policy aimed at avoiding further increases in the unemployment rate and decreases in the GDP growth rate. Expansionary monetary policy means lower interest rates, with the goal being increased consumption and investment, both factors that could worsen the inflation problem already experienced thanks to the global supply shock. Evidence indicates that the inflation problem, even in the US where slow growth usually leads to lower price levels, is not going away:

In the US, a survey-based measure of inflationary expectations recently showed an increase to more than 5 per cent. I would estimate there are now several hundred basis points of difference between the current Fed funds rate and an interest rate that would be consistent with price stability in the medium term.

…meaning the Fed, in its attempt to avoid recession and rising unemployment, has created a condition where real interest rates are actually negative, a highly inflationary condition. All this wouldn’t be so bad if wages in the US were rising along with the price level. This however, does not appear to be happening:

The main difference between the situation in the 1970s and now is today’s absence of wage inflation, which explains why absolute inflation rates are a little more moderate. I guess this is probably because of some combination of deregulated labour markets and globalisation. But the lack of wage-push inflation is not necessarily good news. Falling real wages mean falling disposable income and tighter credit conditions mean less borrowing for consumption.

Rising prices for energy, transportation and food have put American households in a tough situation. In the past, periods of inflation have often been characterized by rising wages, meaning the full brunt of nominal price level increases was not entirely born by the American worker. Today, on the other hand, a recession has thus far been avoided, but the combination of record numbers of “discouraged workers”, rising unemployment and inflation may make the pain of our current economic situation just as real as recessions of the past.

In the words of billionaire investor and economic sage Warren Buffett just today:

“I believe that we are already in a recession… Perhaps not in the sense as defined by economists. … But people are already feeling the effects of a recession.”

“It will be deeper and longer than what many think,” he added.

Discussion Questions:

  1. What is the difference between nominal and real GDP? Which must decline in order for the economy to be in a recession?
  2. What impact do rising energy prices have on the behavior of individual firms?
  3. Why are low interest rates likely to make the inflation problem even worse?

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May 07 2008

“Guns vs. Butter” - a real world example

School kids feel the bite of high food prices - May. 5, 2008

A classic method of teaching the basic economic concept of the production possibilities curve is to illustrate the relationship between a nation’s decision to invest in military goods versus civilian goods. The model typically includes two “products” that a nation can choose to invest in: guns and butter. The goods themselves are not important, rather what they are meant to represent: the tradeoff between defense and civilian focused investment.

Today the United States faces a very real version of the old “guns vs. butter” model. Rising global food prices have put school districts in a bind: how to feed kids nutritious meals as the prices ingredients has risen at unprecedented rates:

Rising food prices are making it harder for schools to cook up ways to give kids the nutrition they need.

Right now, they’re taking shortcuts and shuffling ingredients to make up the difference, but that’s only a short-term solution with long-term consequences on the horizon.

“I’ve been in school service for 27 years and this is the worst it’s ever been,” said Sara Gasiorowski, food service director for Wayne Township Schools in Indianapolis. “I have never seen food prices jump up so far…

“Food prices nationwide have risen 4.5% between March 2007 and March 2008, according to the Bureau of Labor Statistics’ Consumer Price Index, with flour and eggs rising even more dramatically than milk. Grumbles said milk prices in her district are up 22% from last year, which means an increase of 3.5 cents for each of the federally required 16,000 half-pints she provides every day.

“For every penny on a carton of milk, it costs me $30,000 a year,” she said. “That’s $105,000 extra on my food bill.”

Flour prices have roughly doubled over the last year, according to Grumbles, to $19 per 50-pound bag. To make up for the difference, she substitutes canned peaches for fresh apples “to save a couple pennies” per meal, or she uses ground beef in place of chicken.

Unfortunately, federal funding for school lunches has increased at much slower rate than cost to districts of providing those meals:

Federal reimbursement programs cover all or part of school districts’ lunch tabs. Congress lifts reimbursement rates every year, but Gasiorowski said it hasn’t been enough: “We need to be looking at an increase of 12% to 15%, instead of our usual annual increase of 2 or 3%.”

The current federal reimbursement program is based on household incomes; the poorest American students receive $2.47 of federal funding towards their “free lunches”, while students from the highest income bracket only receive $0.23 per meal. The problem is, the average school lunch now costs $3.10, so these days no one is actually receiving a “free lunch”, not even the poorest American students.

This article struck me in that is truly does illustrate the concept of tradeoffs as illustrated in the production possibilities curve. Society must allocate its scarce resources towards the goods and services it deems most desirable based on the needs of its citizenry. Complications arise in this basic model, however, when government is involved.

The commitment to subsidizing school lunches is based on the idea that if the responsibility of feeding American school children were left to the free market, resources would surely be underallocated towards nutritious meals, representing a market failure. School lunches are a merit good, meaning they would be underprovided by the free market.

The same is true of national defense. In fact, some believe that if left completely up to the free market, national defense would not be provided at all, rather individuals who could afford it would hire private security forces to protect their private property. When a good would be totally neglected in a free market, it is called a public good. This is national defense, a good that were it not provided by the government would probably not be produced at all.

Clearly, both “guns” and “butter” create benefits for society. In the case of both national defense and nutritious school lunches, both goods are under-provided by the free market, and therefore should be subsidized or fully provided by the federal government. As this story reveals, however, the US is now in a situation where more resources need to be allocated towards “butter”, perhaps even if this means allocating fewer resources towards “guns”, or any of the other myriad public goods the government provides society with.

Update: I received an email message from a reader about the above blog post:

I have to say that your “guns and butter” diagram is “interesting.” I am not clear on why the United States should spend vastly more on school lunches than on defending the free world While government provided school lunches may have a place, most Americans feed their own children and do not depend on Federal financing.

Where did you get the notion that feeding our children would be “under-provided by the free market”

Here was my reply to this reader. I’m posting it here because I want to make it clear the the diagram above is not meant to make any political statement about US military spending:

Hello,

Actually, the PPC was included simply to illustrate the basic tradeoff that society faces when it chooses how to allocate its scarce resources.

Having taught at least for a short while in public schools, I can say that nutritious lunches are definitely “underprovided” by the free market, that is, many students in poor communities in America depend on the “free and reduced” lunches that are provided through federal and state funding programs… I once volunteer taught in a poor Elementary School in Spokane, Washington where 40% of the students ate only two meals a day, both provided free by the school district: one at 8 in the morning, one at noon. Many of these children had parents who were poor, unemployed, often addicted to drugs, who failed to put any food on the table whatsoever.

In other words, I do think that nutritious meals are a “merit good” which by definition is one that is underprovided by the free market, therefore requires subsidies from the government. Otherwise, why would the government offer such subsidies at all, if these meals were something the free market could adequately provide on its own?

Again, I was not making any political statement with the graph, only pointing out the basic economic concept of tradeoffs and the idea that society must allocate its scarce resources towards an “optimal” combination of goods and services. The article indicates that in this time of rising food prices, not enough of America’s resources are going towards providing nutritious meals for school children, indicating that a movement along the PPC might be in order. The degree of such a move is irrelevant, only the fact that a movement must occur if nutritious meals are to continue to be provided. In fact, the x-axis could have represented any other public good the government provides for society, I chose “military spending” so that the current example was consistent with the classic example of “guns vs. butter”.

Hope that clears things up…

Best,

Jason

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Sep 11 2007

The opportunity cost of sex

From the Undercover Economist:

FT.com / Weekend columnists / Tim Harford - Dear Economist

Is there a relationship between a student’s decision of whether to have sex and his/her performance in school? Tim Harford finds there just might be.

There is little doubt that virgins achieve better grades. Yet is this because sex kills brain cells, or because kids who are already bored at school look harder for ways to amuse themselves?

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