MMPC-010 Managerial Economics – Last Minute
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1. Equi-Marginal Principle ⭐⭐⭐⭐⭐
What is it?
A person gets maximum satisfaction when money is spent in such a way that the last rupee spent on each item gives equal satisfaction.
Simple Example
You have ₹100.
You spend:
- ₹50 on food
- ₹30 on mobile recharge
- ₹20 on entertainment
If spending ₹10 more on food gives less satisfaction than spending ₹10 on entertainment, you should shift money to entertainment.
Key Idea
👉 Use your limited money where it gives the highest benefit.
In Business
A company invests money in different projects and puts more money where profits are higher.
2. Demand Analysis ⭐⭐⭐⭐
What is Demand?
Demand means:
Desire + Ability to Pay + Willingness to Buy
Example
You want an iPhone but have no money.
❌ Desire only
You want it and have money.
✅ Demand
Factors Affecting Demand
- Price
- Income
- Taste
- Fashion
- Population
- Advertisement
Key Idea
👉 Lower price = Higher demand
3. Price Elasticity of Demand ⭐⭐⭐⭐⭐
What is it?
Measures how much demand changes when price changes.
Formula
E_d=\frac{\%\ Change\ in\ Quantity\ Demanded}{\%\ Change\ in\ Price}
Example 1 (Elastic Demand)
Price drops:
₹100 → ₹80
Sales:
100 units → 200 units
Demand changes a lot.
Examples:
- Pizza
- Soft drinks
- Clothes
Example 2 (Inelastic Demand)
Price increases:
₹30 → ₹40
People still buy.
Examples:
- Salt
- Medicines
- Petrol
Main Determinant
⭐⭐⭐⭐⭐ Availability of substitutes
Example:
Coca-Cola price increases.
People buy Pepsi.
Demand is elastic.
Key Idea
👉 More substitutes = More elastic demand.
4. Production Function ⭐⭐⭐⭐
What is Production?
Converting inputs into outputs.
Inputs
- Labour
- Machines
- Raw materials
Output
Finished goods
Example
Bakery
Inputs:
- Flour
- Workers
- Oven
Output:
- Bread
Key Idea
👉 Inputs + Process = Output
5. Law of Variable Proportions ⭐⭐⭐⭐
Meaning
When more workers are added while machines remain fixed, production changes in stages.
Stage 1
Output increases rapidly.
Example:
Adding workers to an empty restaurant kitchen.
Stage 2
Output increases slowly.
Workers start sharing equipment.
Stage 3
Output decreases.
Too many workers create crowding.
Key Idea
👉 Too much of anything becomes inefficient.
6. Returns to Scale ⭐⭐⭐⭐
Meaning
What happens when all inputs increase together?
Increasing Returns
Inputs double → Output more than doubles
Good efficiency.
Constant Returns
Inputs double → Output doubles
Normal growth.
Decreasing Returns
Inputs double → Output less than doubles
Management problems.
Key Idea
👉 Bigger firms are not always better.
7. Isoquant ⭐⭐⭐⭐⭐
What is it?
A curve showing different combinations of labour and machines producing the same output.
Example
100 chairs can be made by:
- 10 workers + 5 machines
- 8 workers + 7 machines
- 6 workers + 10 machines
All produce 100 chairs.
Key Idea
👉 Different combinations can give the same production.
8. Isocost Line ⭐⭐⭐⭐⭐
What is it?
Shows all combinations of labour and machines that cost the same amount.
Example
Budget = ₹1 lakh
Possible combinations:
- More workers + fewer machines
- Fewer workers + more machines
Total cost remains ₹1 lakh.
Key Idea
👉 Same budget, different combinations.
9. Optimal Combination of Inputs ⭐⭐⭐⭐⭐
Meaning
Choosing the best mix of labour and machines at the lowest cost.
Example
A factory wants to make 1,000 shoes.
It can:
- Hire many workers
OR - Buy more machines
Management chooses the cheapest efficient option.
Key Idea
👉 Maximum production at minimum cost.
10. Cost Concepts ⭐⭐⭐⭐
Fixed Cost
Remains same.
Examples:
- Rent
- Insurance
Even if production is zero.
Variable Cost
Changes with production.
Examples:
- Raw materials
- Electricity
Total Cost
Fixed Cost + Variable Cost
Key Idea
👉 Every business has fixed and variable costs.
11. Revenue Concepts ⭐⭐⭐⭐
Total Revenue (TR)
Money earned from sales.
Example:
100 units × ₹50
= ₹5000
Average Revenue (AR)
Revenue per unit sold.
Marginal Revenue (MR)
Extra revenue from selling one more unit.
Key Idea
👉 Revenue tells how much money comes in.
12. Perfect Competition ⭐⭐⭐⭐⭐
Meaning
Many sellers sell identical products.
Examples
- Vegetable market
- Wheat market
- Rice market
Features
- Many buyers and sellers
- Free entry and exit
- Same product
- No control over price
Key Idea
👉 Seller accepts market price.
13. Monopoly ⭐⭐⭐⭐⭐
Meaning
Only one seller controls the market.
Examples
- Patented medicine
- Local water supply
- Railway services (some countries)
Features
- Single seller
- No close substitutes
- High barriers to entry
Key Idea
👉 Monopoly seller can influence price.
14. Perfect Competition vs Monopoly ⭐⭐⭐⭐⭐
|
Perfect Competition |
Monopoly |
|
Many sellers |
One seller |
|
No price control |
Controls price |
|
Easy entry |
Difficult entry |
|
Normal profits |
High profits possible |
Easy Memory Trick
Perfect = Many
Monopoly = One
15. Pricing Decisions ⭐⭐⭐⭐⭐
What is Pricing?
Deciding the selling price of a product.
Business Objectives
- Earn profit
- Increase sales
- Capture market
Example
A new mobile company may keep prices low to attract customers.
Key Idea
👉 Right price attracts customers and earns profit.
16. Price Discrimination ⭐⭐⭐⭐⭐
Meaning
Charging different prices from different customers for the same product.
Examples
Movie Tickets
- Student = ₹150
- Adult = ₹300
Airline Tickets
Same flight.
Different passengers pay different prices.
Mobile Recharge Plans
Different plans for different users.
Why Do Companies Do It?
To earn more profit.
Conditions
- Different customer groups
- No resale
- Seller has market power
Key Idea
👉 Same product, different prices.
1-Day Revision Formula
Remember these simple lines:
- Equi-Marginal → Spend money where benefit is highest.
- Demand → Desire + Money + Willingness.
- Elasticity → Response of demand to price changes.
- Production → Inputs become output.
- Isoquant → Same output.
- Isocost → Same cost.
- Optimal Combination → Lowest cost, highest output.
- Perfect Competition → Many sellers.
- Monopoly → One seller.
- Price Discrimination → Same product, different prices.
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