how prices happen, why firms behave the way they do, and the weather every business lives in.
Jagan Gopinathmentor · business economics
day 1 · monday
what is an economy actually made of?
cold open
a ₹20 bottle of bisleri.
the same bottle costs ₹120 at the airport. same water, same bottle, same brand. so what exactly are you paying for? and where does the ₹20 go after it leaves your hand?
the circular flow of income
your spending is someone's income
follow the ₹20: shopkeeper's margin, distributor's cut, driver's wage, Bisleri's profit, a worker's salary. the loop never stops.
the definition
an economy is an aggregate of transactions.
millions of small trades like yours, added up. nothing more mystical than that.
supply & demand
the two curves behind every price
stand at Chambakkara fish market at 6am and watch this graph run live: big catch, prices fall by breakfast. small catch, they climb by the minute.
movement vs shift
two very different ways a curve changes
price changes move you along the curve. everything else, a festival, a rival, a rumour, moves the curve itself.
day 2 · tuesday
what does it cost, and what will they pay?
you can now see the transaction. today we open it up: the hidden costs inside, and the hidden value on top.
consumer surplus
the gap between worth and paid
running late, you'd have paid ₹150 for that auto. the meter said ₹80. the ₹70 you kept is consumer surplus. every good business hunts that gap.
marginal cost
the cost of one more
one more dosabatter, gas, two minutes of the cook's time. real money every single plate.
one more software userone more login on a server already running. almost zero. this asymmetry builds giants.
opportunity cost
the best alternative you gave up
the stall owner says his shop is free because he owns it. it isn't. its real cost is the salary he'd earn doing something else with those twelve hours. every choice is priced by the road not taken.
elasticity
how demand bends when price moves
₹12 chai goes to ₹15grumbling, then everyone pays. demand barely moves.
₹12 chai goes to ₹25half the crowd walks to the next stall. demand snaps.
elasticity II
elastic vs inelastic, four products
INELASTICpetrolthe tank gets filled at ₹95 or ₹110. you need to get to work.
INELASTICsaltdoubling the price changes nothing. it's ₹25 a kilo either way.
ELASTICmovie ticketsat ₹500 the multiplex empties. the same film streams in a month.
ELASTICswiggy orderssurge fees on, and dinner becomes maggi at home.
fixed vs variable
break-even, on one chart
rent is due whether you sell zero dosas or five hundred. the question every founder must answer: how many units until the orange line crosses?
economies of scale
why big gets cheaper
Amul collects from 3.6 million farmers on one network. the milk run that ruins a small dairy's margins is a rounding error at that volume.
day 3 · wednesday
who sets the price, and what game are they playing?
costs explain the floor of a price. today: everything firms do above that floor.
price discrimination
same product, different prices
train classessleeper, 3AC, 1AC. same train, same time, same destination. three prices.
airline seatsthe person beside you paid half. they booked on a tuesday, six weeks out.
student pricingspotify knows a student's ₹59 is better than their ₹0.
game theory · 1 of 4
your best move depends on their move
firms do not exist in isolation. the outcome of firm A's action depends on what firm B does, and vice versa. and an outcome isn't always someone losing: sometimes both learn to work together, or settle into live and let live.
game theory · 2 of 4 · the prisoner's dilemma
two suspects, one robbery
B stays silent
B confesses
A stays silent
1 month eachthe best joint outcome. neither trusts the other to hold it
A: 12 months, B walkssilence punished, betrayal rewarded
A confesses
A walks, B: 12 monthssame bet, mirrored
6 months eachwhere they actually land
confessing beats silence whatever the other does: strict dominance. individually rational, collectively worse.
game theory · 3 of 4 · the same grid, in business
netflix vs amazon prime
amazon maintains
amazon cuts
netflix maintains
$1,000mn eachboth hold at $10, 100mn subscribers each
$800 vs $960mnthe cutter gains 20mn subscribers
netflix cuts
$960 vs $800mnsame story, mirrored
$800mn eachboth cut. nobody gains a subscriber, everybody loses $2
monthly revenue. a $2 cut wins 20 million subscribers, but only if the rival doesn't match. the rival always matches.
game theory · 4 of 4
equilibrium: live and let live
a nash equilibrium is a set of strategies where no player gains by changing theirs alone. stable, but not always efficient: both confessing is stable and terrible. the full toolkit, dominance elimination and the stag hunt, runs in the deep-dive deck.
market structures
one spectrum, three stops
perfect competitionchai stallshundreds of sellers, identical product, nobody sets the price
oligopolytelecomthree players who watch each other's every move
monopolyrailwaysone seller. the price is whatever the seller decides it is
market failure
when the market alone gets it wrong
the delivery bike gets your biryani to you in 20 minutes. the traffic, the fumes and the risk it creates are paid by everyone on that road, and priced by no one. externalities: costs the transaction pushes onto people who never agreed to it.
day 4 · thursday
what weather is every business living in?
you can now read any firm's pricing. today we zoom all the way out, to the forces no firm controls.
the market's memory
nifty since 2000
four storms in 26 years. every business you'll ever run lives on this line whether it knows it or not.
what is GDP
one country's total spending
C + I + G + NX
C · consumptionyour family's groceries
I · investmenta new factory in Coimbatore
G · governmenta highway through Kerala
NX · net exportscashews out, crude oil in
nominal vs real
inflation eats the headline
a 12% revenue jump in a 6% inflation year is a 6% business. always ask which number you're being shown.
let's look at the real thing
fred.stlouisfed.org
live now: the actual data, the actual charts, the actual weather.
monetary policy
RBI's one dial
the repo rate is the price banks pay RBI for money. turn it down and loans get cheap everywhere. turn it up and the whole economy feels the squeeze.
cheap money becomes risk money
how 2021 happened
rates near zero2020 to 21. money in the bank earns nothing
→
capital hunts returnsif safety pays 0%, risk suddenly looks reasonable
→
the funding floodrecord venture money chases Indian startups at any valuation
hold this chain. it runs in reverse too, and that reverse is thursday afternoon's India Lens.
inflation
what 7.8% CPI does to a business
every input quietly reprices: fuel, packaging, the warehouse worker's lunch. your fulfilment cost creeps up monthly while your price list stays printed. inflation is a tax on standing still.
two levers
fiscal vs monetary
fiscal · the government
taxes and spending
budgets, subsidies, highways
moves slowly, parliament required
aimed at sectors and people
monetary · the RBI
the price and supply of money
repo rate, liquidity
moves fast, six reviews a year
aimed at the whole economy at once
day close
every micro decision from monday to wednesday lives inside this weather.
the firm chooses the price. the economy chooses the mood.
day 5 · friday
what is the rupee doing to your business?
USD-INR
what the number means
₹87 to the dollar is not a scoreboard of national pride. it is the exchange rate between two economies' realities, and it moves your costs whether you trade abroad or not.
who wins when the rupee weakens
the exporters
the kollam cashew exportersells in dollars, pays wages in rupees. every rupee the currency slips is margin gained overnight.
the spice shipperkochi pepper priced in dollars gets cheaper for the world without cutting a single rupee of price.
who loses. and who does both
the other side of ₹87
the importerelectronics, machinery, crude: every container costs more rupees than last quarter.
the student abroadthe same US tuition fee, quietly ₹4 lakh more expensive than at admission.
the gulf remittance familydirhams convert to more rupees at home. but the kerala grocery bill inflates too. both directions at once.
the currency, from the CFO's chair
₹200 crore of imported machinery. the rupee slides.
buy dollars today?lock the rate before it worsens, and pray it does
hedge the risk?pay a known premium to make the unknown someone else's problem
source locally?trade currency risk for supplier risk
raise your price?pass it on, and find out what your elasticity really is
contract in rupees?push the currency problem across the table
why the rate moves at all: interest differentials, FDI and FII flows, and the import bill widening the current account deficit.
week close
you can now read a business, and its weather.
mission showcase at 14:00. bring your business, and everything this week gave you to read it with.
the school of future