Supply chains, disruptions and technology shifts

Detail

1. What a supply chain is

• Supply chain (Class 8, Factors of Production): the network of people, organisations, resources, activities and technology that together make a good and sell it.
• Why it exists: a firm rarely finds every input in one place.
• Raw materials, parts, machines and skilled labour are in different towns and countries.

• The supply chain lets a firm buy inputs from many locations and combine them into one product.

• Class 8 example: the mobile phone flowchart:

• Design: engineers plan the phone.
• Sourcing components: chips, screens and batteries are bought from many suppliers.
• Assembly: the parts are put together in a factory.
• Testing: each phone is checked for quality.

• Distribution: phones reach shops and buyers.

• Class 8 says India was the world's second-largest mobile-phone manufacturer, after China, in 2025.

2. Supply chain disruption: the production-function link

• Production function: the technical relation between inputs and the maximum output they can give, written q = f(L, K). L is labour and K is capital.
• Supply chain disruption: a break in the flow of inputs, so an input does not arrive on time or at the usual price.
• Essential inputs: in NCERT Class 12 Table 3.1 the production function is q = K × L.
• Each input is essential. Without it, nothing can be produced.

• Worked example:

  • K = 4, L = 5 → q = 4 × 5 = 20 units.
  • Suppose a disruption stops the machines or parts from arriving, so K = 0 → q = 0 × 5 = 0 units.
  • The 5 workers are still there, but output is zero.

• The lesson: one missing input can stop all output.

• A firm that depends on far-off sources instead of local inputs can see production halt when those inputs cannot arrive.
• NCERT's example is the COVID-19 lockdowns (Class 8). Factories stopped because parts could not travel.

3. The cost view: how shocks move cost curves

• Cost curves show how cost changes with output. The main ones are TC (total cost), AC (average cost = TC ÷ q) and MC (marginal cost, the extra cost of one more unit).
• A disruption pushes cost curves up:
• Inputs become scarce, so input prices rise.
• Ships take longer routes, so freight (the charge for carrying goods) rises.
• Each unit now costs more, so AVC, AC and MC shift upward.

• Worked example: a firm makes 1,000 units. Variable cost is ₹20,000, so AVC = ₹20. Freight and part prices rise by ₹5,000. Now AVC = 25,000 ÷ 1,000 = ₹25. The AVC curve has shifted up by ₹5 at this output.

• Better technology pushes cost curves down:

• Better technology shifts the production function up, so the same inputs give more output.
• Fewer inputs are then needed for each unit, so cost per unit falls and cost curves shift down.
• Worked example: old technology is q = K × L. New technology is q = 2 × K × L. Take K = 2 and L = 5.
  • Old output: 2 × 5 = 10 units.
  • New output: 2 × 2 × 5 = 20 units.
  • If the inputs cost ₹1,000 in total, AC falls from ₹100 to ₹50.

4. Just-in-time vs just-in-case

• Just-in-time (JIT): the firm keeps very little stock. Inputs arrive only when they are needed.
• Benefit: low storage and interest cost, so it is efficient.

• Risk: there is no cushion if a supplier fails.

• Just-in-case (JIC): the firm keeps buffer stocks (extra inputs held in reserve).

• Benefit: resilience, meaning production continues during a shock.

• Cost: the firm spends more on warehousing and money tied up in stock, so costs rise.

• The trade-off: JIT gives lower cost curves in normal times. JIC gives slightly higher cost curves but protects output when a shock hits.

5. Real-world disruptions

• 2021 semiconductor shortage: chips became scarce. Car makers around the world cut output, because a car cannot be finished without chips (the essential-input logic of q = K × L).
• Suez Canal blockage (March 2021): a ship blocked the canal and trade had to wait or take longer routes.
• Red Sea shipping disruptions (2024):
• The Suez Canal is the shortest sea route between Asia and Europe. About 15% of global maritime trade volume normally passes through it [7].
• Trade volume through the Suez Canal fell by 50% year-on-year in the first two months of 2024 [7].
• Ships went around the Cape of Good Hope instead. This added 10 days or more to delivery times on average [7].
• Shipping costs almost doubled between December 2023 and March 2024. The longer trip used up to US$1 million of extra fuel per round trip [8].

• The problem lasted. More than two years later (2026), transits through the Bab el-Mandeb strait were still at about half their pre-attack level [9].

• Pharma and APIs:

• API (active pharmaceutical ingredient): the chemical in a medicine that actually treats the illness. KSM (key starting material): the basic raw chemical used to make an API.
• India's heavy dependence on imported APIs was a supply-chain risk. India responded with a PLI scheme for bulk drugs (see below).

6. Indian policy responses

• PLI scheme for KSMs / Drug Intermediates / APIs:
• PLI (Production Linked Incentive): the government pays firms a reward linked to how much extra they produce and sell in India.
• Approved/launched 20 March 2020, with an outlay of ₹6,940 crore for FY 2020-21 to FY 2029-30 [5].
• Target: domestic manufacturing of 41 identified bulk drugs that India imported heavily [5].

• Progress (September 2025): capacity created for 26 KSMs/APIs. Cumulative sales reached ₹2,315 crore, including exports of ₹508 crore. This avoided imports worth ₹1,807 crore [6].

• India Semiconductor Mission (ISM), 2021:

• Builds domestic chip and display manufacturing.
• Approved in 2021 with an incentive outlay of ₹76,000 crore [3].
• It offers fiscal support of up to 50% of project cost for silicon fabs, compound semiconductor units, assembly and testing units, and chip design [4].
• By December 2025, 10 projects worth ₹1.60 lakh crore of investment had been approved across 6 states [4].

• Goal: by 2029, India should be able to design and make chips for about 70–75% of domestic applications [4].

• PM Gati Shakti (2021): a national master plan for multimodal infrastructure (road, rail, ports, air and waterways planned together on one digital platform). It cuts delays and the cost of moving inputs.

• National Logistics Policy (NLP), 2022:
• Logistics cost: the total cost of moving and storing goods, including transport, warehousing and inventory.
• Latest official estimate: 7.97% of GDP, from the DPIIT–NCAER report Assessment of Logistics Cost in India (2025) [2]. (NCERT: about 7.8–8.9% of GDP.)
• Older figures of 13–14% of GDP were overestimates based on partial or external data [2].

• NLP targets: logistics cost below 10% of GDP and a place among the top 25 logistics performers by 2030 [2].

• GVCs, China+1 and reshoring are covered in globalisation-mnc.

Prelims Hooks

• Supply chain (NCERT Class 8): the network of individuals, organisations, resources, activities and technology involved in producing and selling a good.
• With q = K × L, if either K or L is zero, output is zero. Both inputs are essential.
• A supply disruption shifts cost curves up. Better technology shifts the production function up and cost curves down.
• Just-in-time means low stock and high efficiency. Just-in-case means buffer stock, high resilience and higher cost.
• The PLI scheme for KSMs/DIs/APIs: ₹6,940 crore, 41 bulk drugs, FY 2020-21 to FY 2029-30 [5].
• India Semiconductor Mission: approved 2021, outlay ₹76,000 crore, fiscal support of up to 50% [3][4].
• India's logistics cost is 7.97% of GDP (DPIIT–NCAER estimate). The old figure of 13–14% was an overestimate [2].
• The Suez Canal carries about 15% of global maritime trade volume. The Cape of Good Hope detour adds 10+ days [7].
• Trap: PM Gati Shakti (2021) is an infrastructure master plan. The National Logistics Policy (2022) is a logistics-cost policy. Do not swap them.

Mains Points

• Efficiency vs resilience:
• Just-in-time and far-off sourcing lower costs in normal times.
• Shocks like COVID-19 (2020), the chip shortage (2021) and the Red Sea crisis (2024) showed that essential inputs make the whole chain fragile.

• Policy now favours some buffers and diversified suppliers, even though this raises costs a little.

• Strategic self-reliance:

• PLI for APIs and the India Semiconductor Mission aim to make critical inputs at home.
• Early results in pharma: ₹1,807 crore of imports avoided (September 2025) [6].

• The critique: these schemes are fiscally costly, and a good result depends on firms becoming competitive, not on permanent subsidy.

• Logistics as a cost-curve shifter:

• Gati Shakti and the NLP lower freight and time costs, which moves Indian firms' cost curves down.

• The revised estimate of 7.97% of GDP [2] also shows that good data (MoSPI/DPIIT-type measurement) is itself a policy tool.

• Technology links to GS-III themes: process technology shifts the production function up. It connects this micro topic to Make in India, competitiveness and export growth.