I was visiting my inlaws the other day, and the alarm sticker on their front window caught my attention. It is one similar to the one depicted here.

It got me thinking about the effectiveness of such a measure. How likely is a thief to believe it? If you were one, would you?
For the sake of this analysis, lets assume that we are dealing with a rational thief. This excludes thieves under the influence, junkies, and a couple other categories. The rational thief is confronted with a choice of trusting or calling a bluff when he sees the sticker. If there is no means to verify the presence of a working security system, then he must rely on the signal alone (if he can verify that there is a security system, then he should move on to an easier target).
The Theory
Out of the total population of people displaying the sticker, if A is the number of people with a working security system, and B the number of people who don’t, then the probability that there is one when randomly picking a house is α = A / (A+B). If we furthermore assume that a house with a security system means a certain outcome of being caught by the police and jailed (we will analyze the effect of uncertain outcome in a later post), then the thief can determine his optimum strategy.
Strategies and equilibrium
If α = 0, the thief will never be caught as there is no security system. His strategy should be to always pick the house with a sticker. If α = 1, then he will always be caught. His strategy should be to never pick a house with a sticker.
But somewhere in between, there is an equilibrium. This equilibrium depends on the payoff, of course. To the extreme, you have a payoff so high that it is worth going to jail for, which results in the outcome strategy of always disregard sticker. On the other end, if there is no payoff, then the outcome strategy is never disregard sticker. Furthermore, the payoff is always relative to the thief ($100 worth of stolen goods does not have the same appeal to all thieves), especially true when considering a professional thief and an occasional one.
Sometimes doubt is enough
You could argue that sometimes, introducing doubt into a rational analysis is enough so that the thief prefers to consider an easier prey – a house with no sticker for instance. This is the rationale behind Microsoft’s famous FUD (Fear, Uncertainty, and Doubt) tactics. People will stick to actions of which outcome they can predict rather than those they cannot. Microsoft’s tactic has been the introduction of uncertainty in the outcome of switching operating system from Windows to Linux. Experience shows us that uncertainty does not need to be grounded, only perceived. The company introduced stories of failure and that proved sufficient.
When it comes to our analysis, displaying a security system sticker produces doubt in the thief’s mind. This most likely increases the likelihood of him moving on to an easier target. If you and a friend are chased by a lion, you do not need to outrun the lion: you only need to outrun your friend. Same goes with your neighbor’s. You only need the thief to perceive that your house is better secured than his. This falls outside of the Handicap Principle and consequently Signal Oriented Marketing, however.
Seem familiar?
If you’ve been following this blog, or know a bit about the Handicap Principle / Signal Oriented Marketing, then this analysis probably seems familiar. It involves mutually distrustful parties (the thief and the house owner), that communicate through a signal (the security system sticker).
The signal between the two parties conveys information about the likelihood of being caught by the police, similar to the gazelle’s stotting about the likelihood of the chasing predator not catching it.
How to bring credibility
Through verifiability
In some specific cases, the presence of a security system can easily be made verifiable. In those cases, it should, similar what Stanford suggests webmasters do in article 1 on its website credibility guidelines. Thus a solution would be to make the security system (cameras) visible.
But in other cases, such verifiability is not as easily attained. If it is not possible for a thief to verify the presence of a security system and he must refer solely to the signal (the sticker), than a system in which each sticker has a unique identifier issued by the security system vendor that, when anonymously given by SMS or Internet to the vendor, would retrieve the house address and validity of the sticker.
The combination of address and validity achieves two things. First, it prevents duplication of stickers, and usage on more than one location. Second, it prevents people without a security system from faking the signal. It ties each reference to a unique location, and makes the signal perfectly trustable.
However this system is complex and relies on the thief’s knowledge of the system, as well as him trusting the anonymity of the lookup process, both of which are not a given. In such cases, it is preferable to use Honest Signaling.
When not verifiable
Honest Signaling allows credibility to be established where the quality of an object is hard to ascertain. If it is not possible to verify some quality of an individual or organization, then there must be something about it (the signal) that conveys information on the quality, in a trustable manner. The way nature has solved this, is by creating handicaps. Signals that are costly in relation to the interaction of parties. This means that there is a penalty if the signal isn’t trusted. You show your strength by imposing a handicap on yourself. Like handicaps in Golf.
If you buy into the concept of biomemetics, this translates to a simple tactic. The signal should welcome thieves to “test our security system here”. Or provide directions towards the security cameras. It should give up information that would be useful to the potential thief. It should impose a handicap upon itself.
You may find this behavior in people being boastful: the security guard so confident that the vault is secure, that he openly talks about secret details on the motion detectors, etc. The opposite is telling as well. If he were unsure about the security of the vault, he wouldn’t talk about it at all.
Conclusion
If you (the reader) were to remember one thing about this rather lengthy blog post, it is that Honest Signals are useful a) when you must convey information on the quality of something to someone who does not trust you, and b) when the quality of that something is hard to measure or ascertain. In that specific case, then you should impose a handicap upon yourself, that is costly in relation to the outcome of the interchange.
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