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Your Personal Discount Rate

28-Jul-10

Scientist Jeff Schweitzer has an interesting and unique, but disturbing (and very real) application of the time value of money concept. He says environments in developing countries are being destroyed because of the infinite discount rates of their starving populations. They prefer the immediate provision of (say) fish from the sea, rather than the distant dream of a perfect ecosystem.

In other words, their personal infinite discount rate makes the future value diminish to zero, and the present value therefore becomes very real, very positive, and very appealing. So they end up choosing the environmentally destructive option which ensures their own survival, at the cost of the long-term preservation of the environment. And the environmental preservation could, in fact, potentially lead to their personal destruction. From the point-of-view of what we have learned about the time value of money, this option is the rational one. Always choose what pays you more, so the moral of the story is: Destroy the environment! Right?

It’s obviously not that simple. But read on, you may end up learning something:

Consider a starving man, who is offered a choice: he can have a sandwich now, or $10,000 a month from now. The unfortunate man will certainly forego future riches for immediate nourishment. He essentially has an infinitely large personal discount rate. …. Now consider a wealthy man given that same choice. The sandwich has zero value to him (he just ate a big lunch), and waiting for the $10,000 causes no pain but some modest gain. He basically has a personal discount rate of zero, meaning he is willing to pay nothing to have a future benefit given to him now.

The actual value of personal discount rate is notoriously difficult to nail down. The value is impacted by personal circumstances such as our age and health, the perceived desirability of what is being offered, the immediacy and urgency of our needs (food, clothing, shelter), our moral commitment to future generations, our emotional state and our level of patience in waiting for a result. [link]

Good New-Bad News

26-Jul-10

James Surowiecki (over at the New Yorker), wrote about financial illiteracy in the issue from a couple of weeks ago. The bad news is that we Americans are clueless about finance, and particularly, our personal finances:

The depth of our financial ignorance is startling. In recent years, Annamaria Lusardi, an economist at Dartmouth and the head of the Financial Literacy Center, has conducted extensive studies of what Americans know about finance. It’s depressing work. Almost half of those surveyed couldn’t answer two questions about inflation and interest rates correctly, and slightly more sophisticated topics baffle a majority of people. Many people don’t know the terms of their mortgage or the interest rate they’re paying. And, at a time when we’re borrowing more than ever, most Americans can’t explain what compound interest is. [link]

That’s the bad news. The good news is that as Managerial Finance students, you are already a couple of steps ahead. You know what compound interest is! We will soon learn what interest rates are all about, and you will also be able to figure out how to calculate your own mortgage payment, and lots, lots more.

So just in case you find yourself wondering why in the world we are learning all these things, take a look at this:

The point isn’t to turn the average American into Warren Buffett but to help people avoid disasters and day-to-day choices that eat away at their bank accounts. The difference between knowing a little about your finances and knowing nothing can amount to hundreds of thousands of dollars over a lifetime. And, as the past ten years have shown us, the cost to society can be far greater than that. [link]

I couldn’t have put it any better myself. Remember that when studying for your exam!

Good luck and drop me a line if you have any questions.

Welcome Managerial Finance Students!

21-Jul-10

It was nice meeting you all last week. I hope you enjoyed it as much as I did.

A couple of things:

  1. I mentioned last week, that I was on the fence about you using Excel for all your calculations. Well, I have hopped over the fence and decided that you may use Excel for all your assignments, in-class problem-solving as well as during the exams. This means that for those of you were deciding on whether to buy a financial calculator, you don’t have to do so.
  2. If you still prefer to use a financial calculator, you are free to do so. But we will not be spending class time on solving problems using it. We will be focusing on Excel in class. You are still free to ask me any troubleshooting questions outside of class, of course.

One last note for the financial calculator users, I just discovered an excellent website called TVMCalcs.com. This is an extensive resource on using many financial calculators specifically for time value calculations. It even has webpages devoted to the two calculators recommended on the syllabus – the HP 12C and TI-83 Plus. The links lead to their respective pages on TVMCalcs.

Here is a description of the author TVMCalcs:

Timothy R. Mayes is a Professor of Finance at Metropolitan State College of Denver with over 23 years of teaching experience. He teaches, or has taught, corporate financial management, financial modeling using Excel, investments, and portfolio management.

Enjoy, and let me know if you have any questions or comments.

Harassment is an Art, Not a Science

08-Jun-10

The TSA continues to find new and innovative ways of harassing airline passengers:

TSA screeners trained to pick out suspicious or anomalous behaviour in passengers. There are about 3,000 of these officers working at some 161 airports across the United States, all part of a four-year-old programme called Screening Passengers by Observation Technique (SPOT), which is designed to identify people who could pose a threat to airline passengers. [link]

I found this off the Economist‘s travel blog, Gulliver:

The programme, known as SPOT, for “Screening Passengers by Observation Technique,” is intended to allow airport security officers to use tiny facial cues to identify people who are acting suspiciously. The British government is currently launching a new screening regime modelled on the Americans’ SPOT. There’s just one problem with all this: there’s no evidence that SPOT is actually effective. [link]

The creator of such techniques, is a psychologist Paul Ekman.

In the 1970s, Ekman co-developed the ‘facial action coding system’ for analysing human facial expressions, and has since turned it into a methodology for teaching people how to link those expressions to a variety of hidden emotions, including an intent to deceive. He puts particular emphasis on ‘microfacial’ expressions such as a tensing of the lips or the raising of the brow — movements that might last just a fraction of a second, but which might represent attempts to hide a subject’s true feelings. [link]

The only problem is that the technique is not scientifically valid.

“Simply put, people (including professional lie-catchers with extensive experience of assessing veracity) would achieve similar hit rates if they flipped a coin,” noted a 2007 report1 from a committee of credibility-assessment experts who reviewed research on portal screening.

“No scientific evidence exists to support the detection or inference of future behaviour, including intent,” declares a 2008 report prepared by the JASON defence advisory group. And the TSA had no business deploying SPOT across the nation’s airports “without first validating the scientific basis for identifying suspicious passengers in an airport environment”, stated a two-year review of the programme released on 20 May by the Government Accountability Office (GAO), the investigative arm of the US Congress. [link]

The TSA (after doing this since 2006) is now commissioning a study to see if it actually works.

In response to such concerns, the TSA has commissioned an independent study that it hopes will produce evidence to show that SPOT works, and the DHS is promising rigorous peer review of its technology programme. For critics, however, this is too little, too late. [link]

This from the organization that allowed at least one (unsuccessful) terrorist onto an airplane, and has harassed countless numbers of non-terrorists. I’m not holding my breath. First, it was nail clippers, then liquids, then shoes. Now what? Faces? Underwear? This is definitely another area that requires radical reform. Most importantly, people need to realize that the real work is not done in airports, but outside them.

An Interesting Debate

08-Jun-10

I found this on Capital Gains and Games, but really, it is a debate (mostly) between Paul Krugman and Raghuram Rajan. Here is a brief synopsis:

Of all the canards that have been offered about the financial crisis, few are more repellant than the claim that the “real cause’’ of the mortgage meltdown was blacks and Hispanics.

Oh, excuse me — did I just accuse someone of racism?   Sorry.  Proponents of the above actually blame the crisis on “government policy’’ to boost home-ownership among low-income families, who just happened to be disproportionately non-white and immigrant.  Specifically, the Community Reinvestment Act “forced’’ banks to make bad loans to irresponsible borrowers,  while Fannie Mae and Freddie Mac provided the financial torque by purchasing billions worth of subprime paper.

The argument has been discredited time and again, shriveling up almost as soon as it’s exposed to sunlight.  But it keeps coming back, mainly because the anti-government narrative gives Republicans a way to deflect allegations that de-regulation allowed Wall Street to run wild.   It’s the financial version of Sarah Palin’s new line that “extreme environmentalists”  caused the BP oil spill.

Paul Krugman caught a whiff of it in a recent commentary by Raghuram Rajan in the FT, and quickly denounced it. [link]

Here’s what Rajan said:

The key then to understanding the recent crisis is to see why markets offered inordinate rewards for poor and risky decisions. Irrational exuberance played a part, but perhaps more important were the political forces distorting the markets. The tsunami of money directed by a US Congress, worried about growing income inequality, towards expanding low income housing, joined with the flood of foreign capital inflows to remove any discipline on home loans. And the willingness of the Fed to stay on hold until jobs came back, and indeed to infuse plentiful liquidity if ever the system got into trouble, eliminated any perceived cost to having an illiquid balance sheet. Chastise the banker who hankers after his bonus, but also pity him for he is looking for his primary measure of self-worth to be restored. Rather than attempting to instill social purpose in him, however, it is probably more useful for society to target the forces that distorted the market. [link]

And here’s Krugman’s response:

That’s a claim that has been refuted over and over again. But what happens, I believe, is that in Chicago they don’t listen at all to what the unbelievers say and write; and so the fact that those libruls in Congress caused the bubble is just part of what everyone knows, even though it’s not true.

Just to repeat the basic facts here:

1. The Community Reinvestment Act of 1977 was irrelevant to the subprime boom, which was overwhelmingly driven by loan originators not subject to the Act.

2. The housing bubble reached its point of maximum inflation in the middle years of the naughties:

3. During those same years, Fannie and Freddie were sidelined by Congressional pressure, and saw a sharp drop in their share of securitization:

while securitization by private players surged:

Of course, I imagine that this post, like everything else, will fail to penetrate the cone of silence. It’s convenient to believe that somehow, this is all Barney Frank’s fault; and so that belief will continue. [link]

The debate continues here, as Rajan responds to Krugman.

To complete the circle, let’s go back to Capital Gains and Games. Here’s the last word on the debate from Edmund Andrews:

The big lesson here was not about government distortions to the market (except perhaps the Fed’s low interest rates).  The big lesson here was that unrestrained, unregulated lending practices by the private sector can be dangerous for consumers and for the financial system as a whole.   To the extent that “government policy” contributed to the crisis, the first failure was in not stopping the reckless private-sector lending and the second failure was in not stopping Fannie and Freddie from following suit. [link]

‘Nuff said, I think. And rightly so.

FAIM 608: Spreadsheets Uploaded

03-Jun-10

I’ve uploaded some spreadsheets to help you with:

  1. Understanding conversion factors.
  2. Convexity adjustments.
  3. Solving Problem 3.23.
  4. Understanding the relationship between futures and expected spot using CAPM (from Chapter 5).

See the sidebar to the right (Lectures 6, 7 and 8).

I’ll be talking about #s 1, 2 and 3 in class today. See you then.

Banning Naked CDSs

24-May-10

A little late in the posting, but Brad Delong on banning naked CDSs:

I say, narrowly, no–that if we can get proper clearing, transparency, and capital adequacy requirements in place banning naked CDOs would not do any good and would do a little bit of harm. But it is a close call. And if we can’t get proper clearing, transparency, and capital adequacy requirements in place then we should ban them.

Let’s go back to first principles. The direct benefits of having more developed, liquid, and sophisticated financial markets are threefold:

  • They allow people to buy insurance: people facing or holding too much of one particular risk can trade piece of it away to others, and so make a win-win deal: the buyer of insurance makes a negative expected value bet but one that, given the magnitude of the distress that would be caused if the risk became reality, they are happy to make; the sellers of insurance make a positive expected value bet.
  • Saving and investment: people with wealth who went to spend later can make win-win deals with people with ideas who need financing to turn those ideas into productive and profitable enterprises.
  • People who have done research and learned information about the structure and likely evolution of the market can bet on their knowledge: they win because they make their positive expected-value bets, and everyone else wins because after they have bet financial market asset prices better reflect fundamental social values and scarcities, and so are better guides to private and public economic planning.

The disadvantages of having more developed, liquid, and sophisticated financial markets are fourfold:

  • People who are excessively and irrationally averse to risks can trade those risks away at a price, and so lose wealth because they are shrinking at shadows.
  • People are are excessively and irrationally unconcerned about risks can trade to accept those risks, and so lose wealth because they are excited by the thrill of tossing the dice.
  • A more developed financial market is one in which it is easier to make money by unfairly appropriating somebody else’s information through insider trading.
  • A more developed financial market is a more fragile market: when prices move suddenly and bankruptcies and failures to deliver emerge, it destroys the web of trust in asset values that the smooth intermediation of the circular flow of economic activity requires, and the result is depression. [link]

I agree. He goes on to quote Geithner:

My own sense is that banning naked (CDS) volumes is not necessary and wouldn’t help fundamentally in this case. It’s too hard to hard to distinguish what’s a legitimate hedge that has some economic value from what people might just feel is a speculative bet on some future outcome…. [T]he absolutely essential thing is that there is more capital held against these positions so we never again face the situation where those types of judgments could imperil the system… [link]

Rated XXX

24-May-10

While the reform bill has gone through, there is still a lot of cleaning up to do. The WSJ talks about firms that can still shop around the ratings agencies, getting the best “deal” for themselves:

In the wake of the financial crisis, the companies that rate bonds have been lambasted for being asleep at the switch and for assigning rosy ratings to questionable mortgage bonds in order to win business. Those ratings companies have made numerous changes, but one thing remains the same: Issuers still “ratings shop” among firms for the most favorable opinions on deals.

The fate of ratings-shopping now hangs in the balance. The financial-regulation overhaul bill passed by the Senate on Thursday would limit the ability of bond issuers to pick firms to rate their securities. But the House version of the bill contains no such provision, and some key lawmakers have raised concerns about the idea. It remains to be seen whether the proposal will survive as the two chambers begin efforts Monday to reconcile their differences. [link]

Quite simply, paying agencies to rate something for you is a clear conflict of interest. This is a huge problem, and poses serious future risks. We shall see what develops, but methinks not too much is going to change down the line. Maybe next time…

FAIM 608: Hunt Brothers (Japanese Version) And Copper Hoarding

13-May-10

If you thought the Hunt brothers story we discussed in class had a moral which was implemented, think again. It was repeated almost two decades later, with very similar consequences. This time though, it wasn’t silver, it was copper. And it wasn’t the US, it was Japan. And the firm was in on it. And just when you think it couldn’t get worse – so were the Chinese. What a sordid tale.

The world copper market is immense; nonetheless, a single trader, apparently, was able and willing to dominate that market. You might have thought that the kind of secrecy required for such a massive market manipulation was impossible in the modern information age–but Hamanaka pulled it off, partly by working through British intermediaries, but mainly through a covert alliance with Chinese firms (some of them state-owned). And as for the regulators … well, what about the regulators? [link]

We will be talking more about copper and the consequences of hoarding copper today in class, when we discuss commodity futures, backwardation and do the contango (not an Argentian dance). Meanwhile, here’s something from The Economist‘s Buttonwood:

A commodity ETF will normally buy the future, not spot, to avoid storage costs.  But sometimes the commodity will be in backwardation (futures prices are below spot) and sometimes in contango (futures are above spot). Backwardation gives futures funds an additional positive return, as they buy low and sell high; contango reduces the return, leaving the futures buyer trailing the spot. And a lot of markets have been in contango. [link]

Does This Pop Your Corn?

11-May-10

Since we’re talking about movies and documentaries today, this post from Marginal Revolution rounds out the trifecta pretty well:

I’ve lately found a new empirical paper on why popcorn is so expensive in the movie theater.  The authors are Ricard Gil and Wesley Hartmann.  Here is the abstract:

Prices for goods such as blades for razors, ink for printers and concessions at movies are often set well above cost. Theory has shown that this could yield a profitable price discrimination strategy often termed “metering.” The idea is that a customer’s intensity of demand for aftermarket goods (e.g. the concessions) provides a meter of how much the customer is willing to pay for the primary good (e.g. admission). If this correlation in tastes for the two goods is positive, a high price on the aftermarket good allows firms to extract a greater total price (admissions plus concessions) from higher type customers. This paper develops a simple aggregate model of discrete-continuous demand to motivate how this correlation can be tested using simple regression techniques and readily available firm data. Model simulations illustrate that the regressions can be used to predict whether aftermarket prices should be above, below or equal to their marginal cost. We then apply the approach to box-office and concession data from a chain of Spanish theaters and find that high priced concessions do extract more surplus from customers with a greater willingness to pay for the admission ticket.

In other words, price discrimination is one (not the only) plausible rationale for why popcorn is so expensive at the movie theater, relative to marginal cost.  For other MR posts, on this problem, type “popcorn” into the MR search box on the left hand side of the page. [link]