It is October in Boston. The leaves are turning. A cool breeze moves through the campus carrying the faint scent of red maple and elm.

Inside a classroom at Harvard Business School, a professor is midway through a lecture on mergers and acquisitions. The subject is synergy — what it is, how to recognise it, and why companies that learn to harness it tend to leap ahead of those that don’t. The students are attentive. The thinking in the room is serious.

Useful knowledge. The kind that takes years to apply.

Cut to Gurugram. A different kind of classroom entirely.

It is mid-afternoon in the middle of summer. Forty-five degrees. The air is thick and still. Breathing feels like an effort. This is not weather — it is an endurance test, served daily to anyone without the luxury of air conditioning or shelter.

On a pavement outside my building, a tailor has set up his sewing machine under a sheet of hoarding he has propped up as shade. It is minimal protection, but it is something.

Across from him, a tea-stall vendor works his station. On days like this, his cold water bucket is as valuable as anything he sells.

I watched them from my balcony over several days. The tailor’s routine caught my attention first — between repairs, he would make a quick dash across to the vendor, not for tea, but to retrieve a bottle of cold water he had placed in the bucket to chill. A small, practical arrangement. Nothing formal about it.

Then one afternoon I looked down, and the tea stall had moved. It was now alongside the tailor, both of them under the same sheet of hoarding.

They had merged their resources. Shelter in exchange for cold water and chai. Simple. Logical. Effective.

What happened next was the part neither of them had planned. Every customer who came to the tea stall left knowing exactly where the nearest tailor was. Every customer who came for alterations left knowing exactly where to get a cold drink. Two small operations, each referring to the other without a system, a strategy, or a single conversation about it. The arrangement created its own momentum.

I lost track of them for a while. When I asked, I was told they had moved into a small shop nearby.

Two classrooms. One lesson.

Synergy is not a business school concept. It is not something that requires a whiteboard, a consultant, or a merger agreement. It is what happens when two people, under pressure, decide that working together serves them better than working alone — and then act on it without overthinking it.

The tailor and the vendor did not study it. They lived it.

That, in my experience, is how most of the important lessons arrive.