🎯 Why Does This Matter?
Because economic growth depends on how much new capital (machines, tools, buildings) a country adds. But machines wear out, so we must subtract that loss to find real growth.
📦 1. Gross Investment (GI)
💡 "Total capital goods produced in a year"
This includes:
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New factories 🏭
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New machines ⚙️
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Tools, equipment 🧰
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Infrastructure 🚧
✅ This is the total investment, including what's used to replace old capital.
🛠️ 2. Depreciation (Consumption of Fixed Capital)
💡 "Loss in value of existing capital due to wear & tear, age, obsolescence"
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Machines break down 🧯
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Tools become outdated 🔧
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Buildings need repair 🧱
🧮 Depreciation = Cost ÷ Useful life
Example:
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A machine costs ₹10 lakh
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Useful life = 10 years
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Annual depreciation = ₹1 lakh
➕ 3. Net Investment (NI)
💡 "Real addition to the nation’s capital stock"
This shows growth — not just maintenance.
🧮 Net Investment = Gross Investment – Depreciation
🏭 Example:
Let’s say in FY 2024-25:
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Gross Investment = ₹500 crore
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Depreciation = ₹200 crore
✅ Net Investment = ₹500 – ₹200 = ₹300 crore
🎯 This ₹300 crore = actual increase in productive capacity.
📊 Easy Table:
| Concept | Meaning | Example |
|---|---|---|
| Gross Investment | All capital goods produced | ₹500 crore |
| Depreciation | Wear & tear of existing capital | ₹200 crore |
| Net Investment | New real addition to capital | ₹300 crore |
🧠 Analogy: Car Maintenance
Imagine you run an Uber business:
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You buy 3 new cars this year 🚗🚗🚗 = Gross Investment
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Your 2 old cars lose value (due to wear) = Depreciation
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Net addition to fleet = 3 – 2 = 1 new working car = Net Investment
📌 UPSC-Ready Key Lines:
🔹 "Depreciation is an allowance for the replacement of worn-out capital."
🔹 "Net investment is what determines the real growth of productive capacity."