Managerial Economics-Week3-Notes

 Managerial Economics-Week3-Notes 

Technology & Production

1. Production Function:

   • General form: $y = f(x),\ f(L, K)$

   • Includes technical and marginal productivity.

   • Technical Efficiency: Related to output maximization from inputs.

   • Diminishing Marginal Returns: As input increases, marginal output decreases after a point.

   • TP, MP, AP curves illustrated (TP: Total Product, MP: Marginal Product).

2. Marginal Product of Labor:

   • $MP_L = \frac{\partial f}{\partial L}$.

   • Range of increasing, diminishing, and negative MP is discussed.

3. Isoquants:

   • Curve representing same output level with varying input combinations.

   • Properties: Convex, downward sloping.

   • Types of Technology: Cobb-Douglas, Linear, Leontief.

   • Marginal Rate of Technical Substitution (MRTS):
     $MRTS = -\frac{MP_L}{MP_K}$

4. Substitutability of Inputs:

   • Degree to which labor and capital can replace each other.

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 4 - Cost Minimization & Isoquants

1. Cost Minimization:

   • Minimize cost $C = w_1x_1 + w_2x_2$ subject to $f(x_1, x_2) = y$.

   • Use of Lagrangian Method.

2. Optimality Condition:

   • MRTS equals input price ratio:

     $$\frac{MP_1}{MP_2} = \frac{w_1}{w_2}$$

3. Isoquant and Isocost Lines:

   • Isoquant: Combination of inputs for a fixed output.

   • Isocost: Combinations of inputs with fixed total cost.

   • Optimal point: Tangency between isoquant and isocost.

4. Different Technology Types:

   • Leontief: Perfect complements.

   • Linear: Perfect substitutes.

   • Cobb-Douglas: Smooth convex curves, typical diminishing MRTS.

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 5 - Cost Functions & Returns to Scale

1. Cost Functions:

   • Total cost $C = w_1x_1 + w_2x_2$

   • Conditional input demand function.

   • Cost minimization yields cost function.

2. Returns to Scale (RTS):

   • Increasing RTS (IRS): $f(tx_1, tx_2) > tf(x_1, x_2)$

   • Constant RTS (CRS): $f(tx_1, tx_2) = tf(x_1, x_2)$

   • Decreasing RTS (DRS): $f(tx_1, tx_2) < tf(x_1, x_2)$

3. Average and Marginal Costs:

   • $AC = \frac{TC}{y},\ MC = \frac{\partial TC}{\partial y}$

   • When AC = MC, AC is minimized.

   • Relation with returns to scale.

4. Cobb-Douglas & Linear Cost Representations:

   • Specific cost functions derived from production functions.

5. Notes on Discreteness & Practical Considerations:

   • CAB (technology with discrete values).

   • Real-world note: Reality often has all three RTS present.

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 Key Concepts Covered:

• Production Theory (TP, MP, Isoquants)

• Cost Minimization

• Optimal Input Choice

• Returns to Scale

• Technological Forms (Cobb-Douglas, Leontief, Linear)

• Graphical Analysis of input combinations and cost structures