What is business economics?
Business economics studies how a firm (a business) makes choices about money, people and goods.
When you meet any problem, a business economist asks four questions:
- Inputs: what do we need? (people, machines, materials, money)
- Costs: what will it cost us?
- Revenue: how much will come in?
- Result: is there a profit, and is the risk worth it?
Thinking like a manager means: set a goal, compare options with numbers, choose, then check the result and improve.
Inputs, output and productivity
The inputs are called factors of production:
- Labour: the work of people.
- Capital: machines, tools, buildings, a juice press.
- Land / natural resources: the place and raw materials, like fruit.
- Entrepreneurship: the person who organises everything and takes the risk.
Productivity tells how well inputs are used. Labour productivity = output ÷ labour hours. 300 glasses in 150 hours = 2 glasses per hour. Using inputs efficiently means more output from the same input, or the same output with less waste.
Costs, revenue and profit
- Fixed cost (FC): does not change with output (rent, insurance, a manager's salary).
- Variable cost (VC): changes with output (fruit, packaging, electricity for the machine). VC = variable cost per unit × quantity.
- Total cost (TC) = FC + VC.
- Average cost = TC ÷ quantity.
- Revenue (R) = price × quantity.
- Profit = R − TC. A negative profit is a loss.
- Profit margin = profit ÷ revenue × 100%.
Example: FC ₹6000, ₹20 per glass, 300 glasses, price ₹50. TC = 6000 + 6000 = ₹12000. R = ₹15000. Profit = ₹3000. Margin = 20%.
Break-even and selling the output
The break-even point is the quantity where revenue = total cost, so profit = 0.
Each unit sold gives a contribution = price − variable cost per unit. This money first pays the fixed cost.
Break-even quantity = FC ÷ (price − variable cost per unit). For the juice stall: 6000 ÷ (50 − 20) = 200 glasses.
To sell the output a firm thinks about the 4 Ps: product, price, place (where it is sold) and promotion (advertising). A lower price may sell more glasses but gives less contribution per glass.
Stakeholders: who cares about the firm?
A stakeholder is anyone affected by the firm's decisions.
- Owners / shareholders: want profit.
- Workers: want good pay and safe jobs.
- Customers: want good quality at a fair price.
- Suppliers: want regular orders and to be paid on time.
- Lenders (banks): want their loan back with interest.
- Government: wants taxes and rules followed.
- Local community: wants jobs and no pollution.
These wishes can clash: higher wages please workers but cut profit. A good manager looks at a decision from each stakeholder's view before choosing.
Key formulas and definitions
- Total cost = fixed cost + variable cost
- Variable cost = variable cost per unit × quantity
- Revenue = price × quantity
- Profit = revenue − total cost
- Average cost = total cost ÷ quantity
- Labour productivity = output ÷ labour hours
- Profit margin = profit ÷ revenue × 100%
- Break-even quantity = fixed cost ÷ (price − variable cost per unit)
Worked examples
1. A bakery has fixed costs of ₹10000 a month and variable cost of ₹30 per cake. It makes 400 cakes. Find the total cost.
VC = 30 × 400 = ₹12000. TC = FC + VC = 10000 + 12000 = ₹22000.
2. The bakery sells all 400 cakes at ₹70 each. Find revenue and profit.
Revenue = 70 × 400 = ₹28000. Profit = 28000 − 22000 = ₹6000.
3. Find the bakery's profit margin and average cost per cake.
Margin = 6000 ÷ 28000 × 100% ≈ 21.4%. Average cost = 22000 ÷ 400 = ₹55 per cake.
4. Find the bakery's break-even quantity.
Contribution per cake = 70 − 30 = ₹40. Break-even = 10000 ÷ 40 = 250 cakes.
5. Two workers make 400 cakes in 160 hours in total. After a new oven they make 480 cakes in the same time. By how much did labour productivity rise?
Before: 400 ÷ 160 = 2.5 cakes/h. After: 480 ÷ 160 = 3 cakes/h. Rise = 0.5 cakes/h, which is 0.5 ÷ 2.5 = 20%.
6. The owner wants to cut workers' hours to save cost. Look at it from three stakeholders' views.
Owner: lower cost, higher profit. Workers: less pay, maybe less motivation. Customers: if fewer cakes or worse quality, they may go elsewhere. A manager compares all three before deciding.
Common mistakes
- Calling rent a variable cost. Rent stays the same whether you sell 0 or 500 units, so it is fixed.
- Mixing up revenue and profit. Revenue is all the money in; profit is what is left after paying all costs.
- Using the price instead of (price − variable cost) in the break-even formula.
- Thinking only the owner matters. Workers, customers, suppliers, lenders, government and the community are stakeholders too.