First principles: why does everyone do an MBA after engineering?

It is the last year of Meera's engineering degree in Nagpur, and dinner has a familiar line in it. Her chacha puts down his roti and says, "Ab MBA kar lo. Engineering ke baad MBA hi toh karte hain." Everyone at the table nods. Her mother is already thinking of the coaching brochure sitting on the shelf.

Meera does not argue. She also does not agree. She notices that nobody at the table has said what the MBA is for.

What first principles thinking is

First principles thinking means taking a decision apart until you reach the things that are plainly true, and then building your choice back up from those. You stop asking what people usually do and start asking what this decision actually rests on.

The idea goes back to Aristotle, who used the phrase for the basic starting points that everything else is built on. Today it is a name for a simple habit: do not borrow the answer, rebuild it.

Meera at the dinner table

That night Meera takes a page and splits the question into plain parts.

First, the work. What does she want to be doing two years from now? She thinks about it honestly. She likes the part of her internship where she explained a plant report to the sales team. She does not like sitting alone with code all day.

Second, the cost. Not only the fee on the brochure, but the hostel, the year of no salary, and the loan her father might take. She writes each one down as a number she can check, not a feeling.

Third, the need. Does the work she wants ask for an MBA? She looks at three job posts for the kind of role she means, and at what they actually ask for. Two want experience and communication. One names the degree.

Now she has something solid. The MBA might still be right for her, because one of those roles does ask for it. Or a different route might get her there at lower cost. The point is that the answer now belongs to her reasons, not to the table's nodding.

Where it stops

First principles takes time, and it is slow for small choices. You do not need it to pick a tiffin. It can also go wrong when you write down a guess and call it a basic truth, such as "this degree is the way into that job". Check each piece you write down: is it a fact you can look up, or a hope?

It is also not a way to wave away your family. Chacha may know something about the market that Meera does not. Put his point on the page as one more thing to test.

One thing to try today

Before tonight, take one big decision your family or friends keep nudging you towards. Write down the three things it rests on: what you want, what it costs, and what it is needed for. If you cannot fill one line with something checkable, that is the line to look into first.

This is a way to think, not financial, medical or legal advice.

Each Sunday: one mental model and one real decision to try it on. Find more in the /models library.