15 Mental Models I Keep Coming Back To : 3 of 15

Here is Part three of a series where I talk about fifteen mental models. Let’s get to it.

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Second Order Consequences

Mumbai recently built India’s first musical road. A 500 metre stretch on the Coastal Road where, if you drive at the right speed, your tyres play Jai Ho.

On paper, it is delightful. Infrastructure meets culture. A small moment of joy in an otherwise mundane drive. And then reality showed up.

Lane discipline was one issue. But the bigger problem was noise. Not at 6 pm when everyone’s awake. At 3 in the morning, when the same stretch keeps playing Jai Ho and people are trying to sleep. Residents started complaining. A lot. Enough that authorities stepped in. Now, that stretch gets barricaded at night. Not removed. Just… switched off when people actually need silence.

Same road. Same idea. Very different outcome once you follow it a step further. This is the pattern.

First order thinking asks, “What happens next?”
Second order thinking asks, “And then what happens after that?”

Most decisions look good in the first layer. The problems usually sit in the second or third. There is a classic story called the Cobra Effect. During colonial rule in Delhi, the administration wanted to reduce the number of cobras. So they offered a bounty for every dead cobra.

At first, it worked. People brought in snakes and collected rewards. Then people started breeding cobras. When the government caught on and scrapped the program, the now-worthless snakes were released into the wild. The cobra population ended up higher than where it started.

The incentive solved the first order problem and made the second order problem worse. This is something Charlie Munger used to hammer home. Incentives drive behavior. And behavior, when scaled, creates consequences you did not plan for.

You see this everywhere once you start looking.

Cut costs aggressively and margins improve. That is first order. Second order, product quality could drops, customers could leave, etc. Even in markets, this shows up all the time. A strategy works, capital floods in, and the very act of crowding kills the edge that made it work in the first place.

The tricky part is that second order effects are not always obvious. They are slower. Indirect. Often uncomfortable to think about because they force you to admit that a “good idea” might carry hidden costs.

So what do you actually do with this?

First, stretch the timeline. When evaluating a decision, mentally walk it forward. Not just tomorrow, but a year out, five years out. Ask what changes as people adapt to your decision. Because they will.

Second, think in incentives. People respond to what you reward, not what you say. If there is a loophole, someone will find it. Usually faster than you expect.

Third, invert. Instead of asking “how does this help”, ask “how could this backfire?” It is a simple question that catches a surprising number of blind spots.

And finally, accept tradeoffs. Second order thinking does not mean paralysis. It just means you go in with your eyes open. Every decision has downstream effects. The goal is not to eliminate them. It is to choose which ones you are willing to live with.

The musical road still might be a good idea. It just turns out that joy, when looped infinitely at high volume, becomes noise.

Anyway, that’s my brain dump for today. Thanks for sticking around.

Cover image taken from Unsplash