NCERT Solutions for Class 9th Social Science Chapter 9 Does Market Equilibrium Exist in the Real World?

Q1.

Can you think of another real-life example (other than hotels) where prices change frequently? Explain why the prices keep changing.

Answer

Method. Pick something whose price you can actually watch change — then explain it using the chapter's two curves rather than by saying “because of demand and supply”. For each example ask three questions: is the supply fixed or slow to change? does demand swing from day to day or hour to hour? and does the good lose value if it is not sold? Wherever the answer to all three is yes, prices will change frequently.

What a good answer must contain: one clear example, the specific reason its supply cannot adjust quickly, the specific reason its demand keeps moving, and what happens to the equilibrium as a result.

Sample answer: tomatoes in the local vegetable market. The price of tomatoes in my market changed three times in a fortnight — from about the price of a normal week, to nearly double after two days of heavy rain, and then down again when fresh trucks arrived.

Question	Tomatoes
Is supply fixed or slow?	Yes — a crop takes months to grow, so today's supply is whatever has arrived in the mandi today. Rain on the road or a damaged crop cuts it at once and nothing can replace it
Does demand swing?	Yes — households buy more before festivals and weddings, less in the middle of the month
Does the good lose value if unsold?	Yes — tomatoes rot in a day or two, so sellers must clear stock at whatever price it takes

Other examples that pass the same test: air tickets and train tatkal fares (the number of seats is fixed and the demand for a particular date keeps changing), cab fares at rush hour and in the rain, gold and share prices, cinema tickets that cost more on a Saturday than a Tuesday, and prices on e-commerce apps that change several times a day.

Why prices, and not quantities, do the adjusting: when supply cannot be increased today — no more tomatoes, no more seats on tonight's flight — the whole adjustment has to happen through price. That is why the goods with the most fixed supply are exactly the goods with the most jumpy prices.

Q2.

Our choices today affect future resources. For example, high demand for fast fashion, overfishing and overuse of groundwater can harm future supply. So, should we focus only on short-term gains, or also think about long-term sustainability? How could this affect the market equilibrium?

Answer

A market that looks at today's price alone can be in perfect equilibrium and still be destroying the supply it will need tomorrow — which is why the long-term view has to be added deliberately. Today's equilibrium reflects today's demand and today's supply. It carries no information about whether the resource behind that supply will still exist in twenty years.

Trace the chapter's three examples through the two curves.

Today	What it does to the resource	What happens to future equilibrium
Fast fashion — very high demand for cheap clothes, worn briefly and discarded	Heavy use of water, dyes and land for waste; cotton land and water are diverted from other uses	Costlier inputs and scarcer water raise the cost of production, so the supply curve shifts left: price higher, quantity lower
Overfishing — catching faster than fish can breed	The breeding stock itself shrinks — this is the ‘depletion of resources’ from page 203	Future supply falls whatever the price, so fish become expensive and fishing communities lose their livelihood
Overuse of groundwater — pumping more than the rain replaces	The water table falls; wells must be dug deeper each year	Irrigation costs rise, farm output falls, and food prices rise — a leftward shift in the supply of many crops at once

Using up the resource that supply depends on pushes the supply curve left. With demand unchanged, the new equilibrium sits at a higher price and a smaller quantity — people get less, and pay more for it.

So the answer is: both, but with the long term deciding the limits. Short-term gains are not wrong in themselves — they are how a fisherman feeds his family this month and how a firm stays in business. The problem is that no single buyer or seller has any reason to hold back, because the cost of the extra fish caught or the extra water pumped falls on everybody later. It is the same reasoning as the neighbourhood park on page 207, turned upside down: there, nobody would pay for a shared benefit; here, nobody counts a shared cost.

What this implies for the market: equilibrium tells you the price at which today's market clears. It does not tell you whether that price is right for the future, because the future's costs are not in today's supply curve. That gap between the two is exactly why the chapter turns next to the role of government.

Try this: ask what would change if the future cost were included — deeper wells priced into the cost of water, or the cost of restocking a fishery counted in the cost of fish. Supply would be smaller and prices higher today, and the resource would last longer. Comparing the two outcomes is the whole sustainability argument in one diagram.

NCERT Solutions for Class 9th Social Science Chapter 9 Does Market Equilibrium Exist in the Real World? — THINK ABOUT IT