Practical Applications of Tools of Demand and Supply Analysis

• For essential goods like food grains, kerosene, sugar, edible oil, cement, steel, coal, etc., the government may legally fix prices.
• When the government fixes the maximum or minimum price of a commodity by law, it is called price control.
• When the government fixes the maximum quantity that each consumer can buy at the controlled price, it is called rationing.

• Demand curve DD slopes downward.
• Supply curve SS slopes upward.
• They intersect at point E.
• Equilibrium price = OP.
• Equilibrium quantity = OQ.​

Now consider two cases of government-fixed price:

Case 1: Controlled price above equilibrium (no effect)

• Suppose the government fixes the maximum price at OP₁, which is higher than the equilibrium price OP.
• Buyers and sellers prefer to trade at the lower equilibrium price the government OP.
• So a maximum price set above equilibrium is not effective; the market continues at equilibrium price and quantity.​

Case 2: Controlled price below equilibrium (binding price ceiling)

• Suppose the government fixes the maximum price at OP₂, which is below the equilibrium price OP.
• At a lower price OP₂:
  Quantity demanded rises to OQ₂.
  Quantity supplied falls to OQ₁.
• There is excess demand = Q₁Q₂.
• This shortage means many buyers cannot get the commodity at the controlled price.​

• When traders do not follow the legal controlled price and take advantage of shortages, they may charge more than the government-fixed price.
• Black market is a situation where goods are sold at a price higher than the official controlled price; the extra premium is illegal and violates the price control law.
• A black market arises because demand is greater than legal supply at the controlled price, and some buyers are ready to pay extra.

• To distribute the limited supply more fairly and reduce black marketing, the government may introduce rationing.
• Under rationing, each consumer is allowed to purchase only a fixed quantity of the commodity at the controlled price (for example, through ration shops).
• This ensures that at least part of the demand of all consumers is satisfied instead of only a few buying large quantities.​

Data from the example

• Equilibrium price of kerosene = ₹4 per litre.
• Equilibrium quantity = 30 lakh litres.
• The government fixes a lower controlled price of ₹3 per litre.
• At ₹3 per litre:
  Quantity demanded = 40 lakh litres.
  Quantity supplied = 20 lakh litres.​

Analysis

• Shortage = 40 − 20 = 20 lakh litres.
• This shortage of 20 lakh litres can lead to:
  Black market, where some consumers pay more than ₹3 to get kerosene,
  or
  Rationing by the government to distribute available supply among consumers.
• Thus, the demand–supply model helps predict the consequences of fixing the price below equilibrium.​

Why farmers need price support

• Agricultural products (like wheat, rice, sugarcane, etc.) are seasonal; most output is brought to the market during the harvest season.
• Supply is very high in that period, but demand is spread throughout the year.
• If only market forces operate, price during harvest can fall sharply because supply is temporarily very high.
• Very low prices reduce farmers’ income and discourage them from increasing production in the future.

Minimum Support Price (MSP) and price floor

• To protect farmers, the government announces a Minimum Support Price (MSP) for certain crops.
• MSP is the minimum price at which the government is willing to buy the crop from farmers, even if the market price falls below this level.
• MSP acts as a price floor:
  If the market price tends to go below MSP, farmers can sell to government agencies at MSP.
  This prevents the price from falling too low and ensures a remunerative price to farmers.​

How price support works

• During harvest, when there is excess supply, private traders may not buy the entire crop at MSP.
• Government agencies step in and purchase the surplus at MSP.
• This policy:
  Supports farmers’ income and gives them incentive to maintain or increase production.
  Helps stabilise agricultural prices over time by preventing extreme falls.​

Labour market and wage determination

• In the labour market:
  Demand for labour comes from firms/employers.
  Supply of labour comes from workers.
• When the supply of labour is greater than demand, competitive market forces tend to push down the wage rate.
• Very low wages cause hardship to workers and their families.​

Meaning and purpose of minimum wage

• To protect workers, the government may fix a minimum wage by law.
• Minimum wage is the lowest wage rate employers are legally allowed to pay.
• Main objectives:
  i. Provide social security and a minimum standard of living to workers.
  ii. Prevent exploitation of labour in situations of excess supply.​

Effect of minimum wage on employment

If the minimum wage is set above the market equilibrium wage:

• More workers are willing to work at the higher wage (labour supply increases).
• Some employers may hire fewer workers because the cost of labour has increased (labour demand decreases).

This can create an excess supply of labour, i.e., some unemployment among low-wage workers. Therefore, along with fixing minimum wages, the government should also try to increase demand for labour by:
i. Promoting labour-intensive industries and activities.
ii. Running public works and employment programmes.​

• Demand–supply tools help analyse government policies like price control, price support and minimum wage laws.
• Price control (price ceiling) below equilibrium creates excess demand and shortage; if above equilibrium, it has no effect.
• Shortage under price control can cause a black market or require rationing to distribute limited supply.
• For agriculture, a price support system using MSP acts as a price floor and protects farmers from very low prices during harvest.
• Government buying surplus at MSP stabilises farmers’ income and supports future production.
• In labour markets, minimum wage laws protect workers from extremely low wages but may create some unemployment if set above equilibrium.
• To reduce unemployment created by high minimum wages, the government must encourage activities that increase demand for labour.​