Chapter 01 · The core idea
The Local
Multiplier Effect
The single most important idea in this guide: a rupee spent at a local, independent business is worth far more than a rupee — because it doesn't stop moving.
- A rupee spent locally doesn't stop — it gets re-spent again and again, paying several neighbours before it leaves.
- The multiplier (LM3) measures that: at a ~68% local share, ₹100 becomes ~₹214 of local activity in three rounds.
- Independent shops recirculate far more than chains (68% vs 43% in one Chicago study) — retention is the lever.
01 The idea, at your depth
One rupee, many jobs.
Imagine you spend ₹100 at the kirana down the lane. That's not where the ₹100's story ends — it's where it begins.
The shopkeeper uses part of it to restock from the local mandi, pays a helper, and buys lunch at the dhaba next door. The helper takes their wage and buys vegetables. The vegetable seller pays the auto driver. The same ₹100 quietly pays five or six different people before it finally leaves the neighbourhood.
Now imagine you'd spent that ₹100 on an app instead. It leaves in one hop — to a warehouse in another city, a head office far away. One transaction, and it's gone.
That difference — money that keeps circulating versus money that leaves at once — is the local multiplier.
The local multiplier measures how much total local income is generated by an initial unit of spending, as it is re-spent in successive rounds.
If a share s of each round is re-spent locally, the rounds form a geometric series: 100 + 100s + 100s² + 100s³ … The New Economics Foundation's LM3 stops at three rounds (most of the effect happens early) and scores it as:
LM3 = (Round 1 + Round 2 + Round 3) ÷ Round 1
In NEF's worked example, £100,000 of B&B income re-spent at 80% locally scores LM3 = 2.20 — every £1 of income became £2.20 of local activity. Lower the local share and the multiplier collapses toward 1.
For a local government or anchor institution, the multiplier reframes procurement as economic development. The question isn't only "what does this cost?" but "how many times will this rupee turn over before it leaves our jurisdiction?"
Shifting spending toward local suppliers raises the multiplier and, with it, local jobs and tax base — without a single extra rupee of budget. This is the mechanism behind the Preston Model (Ch.06), where anchor institutions lifted locally-retained spend from 5% to 18% in five years.
The policy lever is retention: every percentage point of leakage plugged compounds across rounds. Chapter 06 turns this into a working policy lab.
A local economy doesn't get richer only by earning more. It gets richer by keeping each rupee moving locally for longer.
Every rupee that leaves on its first hop — to a distant chain or app — is a rupee that pays its five jobs somewhere else. That's leakage (Ch.02).
02 Play the model
Turn the dials. Watch a rupee multiply.
Set how much you spend and how much of each round stays local. The model re-spends it round by round, the way real money moves.
03 The evidence
Measured, again and again.
Researchers keep running the same experiment — track a rupee (or dollar) at a local independent shop versus a chain, and see how much stays in the local economy. The independents win every time.
| Study · place | Year | Local indie | Chain |
|---|---|---|---|
| Andersonville, Chicago | 2004 | 68% | 43% |
| Salt Lake City · retail | 2012 | 52% | 14% |
| Salt Lake City · restaurants | 2012 | 79% | 30% |
| San Francisco · retail | 2007 | 33% | 12% |
| Austin · books (per $100) | 2002 | $45 | $13 |
Civic Economics studies, compiled in Ten Years of Studies (2012). US data — the mechanism is universal; India's dense kirana network makes the local share unusually high.
Questions worth asking
What exactly is "LM3"?
Why stop at three rounds?
Does this really apply in India?
So is buying online always bad?
Retention is the lever. The multiplier is what you gain; leakage is what you lose; Chapter 06 is how you tune it.