A long read · 25 minutes · three machines to break
What is macro?
The Sunday series exists because ISB made macro optional. This essay is the series' skeleton: the two time horizons, the one lever everyone overrates, and the expectations game that decides whether policy works at all. It pairs with the Indian financial system read — that one is the plumbing; this one is the weather.
Chapter 1Two clocks, one economy
Nearly every macro argument on television is two people talking about different clocks. Macro runs on two: the long run, where prices adjust and output is set by how much an economy can produce — labour, capital, productivity — and the short run, where prices are sticky and output is set by how much people are willing to spend. Most policy fights are one person making a long-run claim and another making a short-run claim, each correct on their own clock, neither noticing the clocks differ.
The professor's GDP discipline sits underneath both clocks, and it is stricter than the textbook's. GDP is not money. It is the sum of utilities — the value of things people actually want — represented in money. You cannot create GDP with utility-less transactions, however much money changes hands. Keep that test handy: it retires half the schemes you will hear pitched in your career.
Chapter 2The long run — productivity or nothing
In the long run, the notes are almost brutal in their simplicity: living standards are set by output per person, and output per person grows with productivity. Land and labour hit limits; capital runs into diminishing returns; what compounds without limit is doing more with the same — technology, organisation, skills, institutions that let a farmer's child become an engineer. Feel what the compounding does:
This is why the series keeps returning to reforms, competition, and open trade even in sessions nominally about money: nothing the RBI or the Budget does can substitute for productivity growth. Demand policy exists for a different job — the short run. Which is behind the login, along with money and the expectations game.
The short run sits behind the login.
The multiplier, why printing money works until it doesn't, and the expectations game — sign in once and it stays open.
Chapter 3The short run — spending sets output
Now stick the prices. In the short run firms meet demand at posted prices, so total spending decides total output. (Price rigidity — he has said, mid-lecture, that only he gets this excited saying the words "price rigidity"; it is that fundamental. Sticky prices are the hinge the entire short run swings on.) One person's spending is another's income, which funds the next round of spending — the multiplier chain. This is the Keynesian cross from the October sessions, and it is why a downturn can feed itself: everyone saving more simultaneously cuts everyone's income (the paradox of thrift from the daily questions). Run the chain:
Chapter 4Money, and the game of expectations
Where does money sit in this? The financial-system essay builds the plumbing — deposits created by lending, priced in the RBI's corridor. Macro asks the other question: when the central bank loosens, does anything real happen? The IMS notes answer with three rounds, escalating in honesty. Round one, no inflation: stimulus lands on slack, output rises, everyone wins. Round two, unexpected inflation: the stimulus is partly eaten by prices — workers accepted wages expecting 4% inflation, got 7%, and effectively took a pay cut they didn't agree to.The notes run all three rounds on a toy rice economy, with named students in the footnotes. To one who answered too cleverly: "Please accept 100 lashes from me as a compliment. You slept through 2 lectures." A named footnote is his highest form of attention. Round three is the real world: it depends entirely on what people expect, and expectations come in flavours:
This game is why central banking is nine parts credibility and one part plumbing. An RBI that is believed can look through a vegetable-price spike and hold; an RBI that is doubted must over-tighten just to prove itself — the difference is worth percentage points of GDP. And the caveat on the caveat, his standing warning: all of this works if inflation expectations hold still — if they move, the same policies turn counterproductive. Refer to the UK case. It is also why the inflation-targeting framework, the 4% anchor, and all the careful MPC communication exist: they are machinery for manufacturing anchored expectations. When you watch the next policy announcement, watch the language, not just the number — the language is aimed at the expectations machine above. (The open-economy extensions get their own Sunday sessions, where you will also hear his considered academic view of the Mundell–Fleming model: "total buckwas." He will then teach it to you anyway, properly, so you know exactly what you are dismissing.)
The long run is productivity. The short run is spending. Money is a promise, and expectations decide what the promise buys.
That is macro — the art around the KPI. The science of the KPI is in the corporate finance read; the plumbing is in the financial system one. The professor's mock exam covering all of it is in the practice room.