Personal Finance, Part 15 — How I Buy Cars – The Aleph Blog

Helping Institutions and Ordinary People Invest Better by Focusing on Risk Control

Posted on 14 March 2008 by David Merkel

When I buy a car, I analyze what car I would like to buy.? I look at reliability, repair costs, overall costs, and style.? I use Consumer Reports to help me analyze this.? Then I go to the website(s) of the manufacturer in question, and copy the data on all of the used models on offer at the dealerships within 30 miles of me.? With price as the dependent variable, I then run a regression with model year as dummy independent variables, and total miles as an independent variable.? After I run my regression, I look at the cars with the biggest price deviations, the predicted price is a lot higher than actual.? I then look at the features of the underpriced cars, and choose one where there are good features with a discounted price.

I go to that dealer, review the car, test drive it, and if it passes my tests, I haggle over the price, and buy it. ? In my experience, this cuts thousands off the price of the car.? What a great reason to have studied econometrics.

One thought on “Personal Finance, Part 15 — How I Buy Cars”

Annette says:

15 March 2008 at 6:34 am

David,

Greatly enjoy reading your blog, as I have enjoyed and benefited by your RealMoney articles over the years. Yours is a voice of reason and calm, and very welcome in these “shrill” days.

A quick comment about price discovery for car buying: Ebay is simply amazing in that respect.

Best wishes!

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David Merkel is an investment professional, and like every investment professional, he makes mistakes. David encourages you to do your own independent "due diligence" on any idea that he talks about, because he could be wrong. Nothing written here, at RealMoney, Wall Street All-Stars, or anywhere else David may write is an invitation to buy or sell any particular security; at most, David is handing out educated guesses as to what the markets may do. David is fond of saying, "The markets always find a new way to make a fool out of you," and so he encourages caution in investing. Risk control wins the game in the long run, not bold moves. Even the best strategies of the past fail, sometimes spectacularly, when you least expect it. David is not immune to that, so please understand that any past success of his will be probably be followed by failures. Also, though David runs Aleph Investments, LLC, this blog is not a part of that business. This blog exists to educate investors, and give something back. It is not intended as advertisement for Aleph Investments; David is not soliciting business through it. When David, or a client of David's has an interest in a security mentioned, full disclosure will be given, as has been past practice for all that David does on the web. Disclosure is the breakfast of champions. Additionally, David may occasionally write about accounting, actuarial, insurance, and tax topics, but nothing written here, at RealMoney, or anywhere else is meant to be formal "advice" in those areas. Consult a reputable professional in those areas to get personal, tailored advice that meets the specialized needs that David can have no knowledge of.