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Concept of Supply

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Topics

  • Introduction 
  • Features
  • Types of Supply
  • Difference Between Stock and Supply
  • Factors Affecting Supply
  • Supply Schedule
  • Supply Curve
  • Distinction: Supply vs. Quantity Supplied
  • Real-Life Application
  • Key Points: Concept of Supply
CISCE: Class 12

Introduction

  • Supply is the amount of a good or service that sellers are willing and able to offer for sale at different prices during a certain time (day, week, month).​
  • Always stated with both price and time.
    Example: "At ₹10 lakhs, 200 cars will be supplied per day by the car dealer."
CISCE: Class 12

Features

  • It is the desired quantity—what producers are willing to sell.
  • Linked to price—changes in price mean changes in supply.
  • Expressed as a flow variable (per day, week, or month).​
CISCE: Class 12

Types of Supply

CISCE: Class 12

Difference Between Stock and Supply

Aspect Stock Supply
What is it? Total available quantity at a time​ Amount offered for sale at a price over time​
Time element At a single point (static)​ Over a period (dynamic)​
Basis Does not depend on supply​ Depends on stock available​
Example All bread in a bakery​ Bread offered to sell at today’s price​
Purpose Storage/Readiness​ Actual selling in market
CISCE: Class 12

Factors Affecting Supply

  1. Price of the Commodity: Higher price → Higher supply.
  2. Price of Related Goods: Producers may switch to costlier alternatives.
  3. Cost of Production: Higher costs usually decrease supply.
  4. Technology: Better tech can increase supply.
  5. Natural Factors: Good harvest/weather increases supply.
  6. Number of Sellers: More sellers = more supply.
  7. Transport & Communication: Better facilities aid supply.
  8. Goals of Firm: Different goals affect supply.
  9. Producer Agreements: Pools/collusions can restrict supply.
  10. Future Expectations: Sellers may hold back supply if prices are expected to rise.​
CISCE: Class 12

Supply Schedule

Supply Schedule Example:

Price (₹) Quantity Firm A Quantity Firm B Market Supply
10 50 100 150
20 100 200 300
CISCE: Class 12

Supply Curve

  • Individual Supply Curve
    The individual supply curve is a graphic presentation of the supply schedule of an individual firm in the market. Curve indicated the upward sloping. It shows a positive relationship between price of a commodity and quantity supplied.
  • Market Supply Curve
    The market supply curve is a graphic presentation of supply schedule of all firms producing a particular commodity in the market. It is supply curve of the industry as a whole. It can be derived by way of horizontal summation of supply curves of all the firms in the industry.
CISCE: Class 12

Distinction: Supply vs. Quantity Supplied

  • Supply: A Whole set of quantities at different prices.
  • Quantity Supplied: Amount offered at one specific price.
CISCE: Class 12

Real-Life Application

  • A fruit vendor has 50 apples (stock). If apples are ₹20 each, the vendor is willing to sell 40 today (supply is 40).​
  • All bakers in a city together offering bread at today’s price = Market Supply.
Maharashtra State Board: Class 12
CISCE: Class 12

Key Points: Concept of Supply

  • Supply is about "ready to sell", linked to both price and time.
  • Supply ≤ Stock.
  • Stock is what’s on hand; supply is what’s for sale.​

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