Q1.
What happens to the supply of a product in case of a change in the cost of inputs, discovery of an alternate input, depletion of resources, change in weather, disaster, etc.? Discuss in class using examples of diverse goods and services.
Answer
Every one of these changes what a seller is willing to offer at the same price — so each one shifts the whole supply curve, left or right, rather than moving the seller along it. That is the single idea the box is testing, and it applies to a farm, a factory and a service alike.
| Change | Effect on supply | Why | Example to discuss |
|---|---|---|---|
| Cost of inputs rises | Supply falls (curve shifts left) | Each unit now costs more to make, so at the old price fewer units are worth producing | Costlier diesel raises transport costs for a vegetable trader; costlier steel for a cycle factory |
| Cost of inputs falls | Supply rises (curve shifts right) | Production becomes more profitable at every price | Cheaper electricity for a flour mill |
| An alternate input is discovered | Supply rises | A cheaper or more easily available input lowers the cost of production — the same effect as better technology | Using bagasse instead of wood for paper; jute or paper substituted for plastic in packaging |
| Resources are depleted | Supply falls, and keeps falling | The raw material itself is running out, so no price can call forth the old quantity | Falling groundwater in a farming belt; overfished waters yielding smaller catches |
| Weather changes | Supply falls or rises | Output of anything grown or transported depends directly on weather | Unseasonal rain damaging the onion crop; a good monsoon raising the paddy harvest |
| A disaster strikes | Supply falls sharply | Production and the roads, storage and workers that carry goods are all disrupted at once | A flood cutting a highway so mangoes cannot reach a distant market |
What happens next, in every case: demand has not changed, so the shifted supply curve cuts the same demand curve at a new point.
Supply falls → at the old price, QD > QS → shortage → price is bid up
Supply rises → at the old price, QS > QD → surplus → price is pushed down
Supply rises → at the old price, QS > QD → surplus → price is pushed down
Services work the same way. If a hospital's cost of imported equipment rises, or a bus operator's fuel bill goes up, the number of services offered at the old fare or fee falls. If a new software tool lets a coaching centre teach more students with the same teachers, the supply of classes rises.
Why this is not the Law of Supply: the Law of Supply says a higher price brings a larger quantity supplied. Here the price has not moved at all — the cost, the input, the resource or the weather has. Confusing the two is the commonest error in this chapter: a price change moves you along the supply curve; everything in this table moves the supply curve itself.