The iPhone in your pocket touched at least 175 different suppliers[1] across 25+ countries before it reached you. The chip came from a TSMC fab in Taiwan[1]. The display came from a Samsung or LG factory in South Korea[1]. The aluminum housing was sourced from suppliers in China[1]. Final assembly happened at a Foxconn plant in Zhengzhou, China, one of the largest facilities Foxconn runs[2].

When all of this works, you don't notice. When it breaks, the whole world notices. That's a supply chain.

What a supply chain actually is

A supply chain connects every individual and business involved at each stage of producing and distributing a product, from acquiring raw materials to final customer delivery.

Supply chains come in 3 sizes: local (a corner bakery sourcing flour from a regional mill), regional (a furniture chain sourcing wood from East Coast forests), or global (Apple, Nike, almost every major brand).

Bigger chains let you produce things cheaper and at higher quality, because each component gets sourced from wherever it's best made. Bigger chains also break in more places.

How a goods supply chain flows

For a physical product, the chain typically moves through 5 stages:

  1. Raw materials acquired. The iPhone's lithium likely gets mined in Australia or Chile[5]. Glass starts as silica sand.
  2. Component manufacturing. Raw materials get turned into parts: chips, screens, batteries, lenses. Each component has its own factory.
  3. Final assembly. Components ship to factories run by Foxconn that assemble many parts into a finished iPhone.
  4. Storage and distribution. Finished iPhones move to warehouses (Apple uses both their own transportation and partners like UPS).
  5. Retail or direct delivery. iPhones go to Apple Stores, third-party retailers (Best Buy, service carriers), or directly to customers ordering online.

For a services supply chain (Spotify, Netflix, your local doctor's office), the chain is shorter:

  1. Hire employees.
  2. Secure resources (servers, equipment, and content licensing).
  3. Build delivery systems (apps, networks, physical locations).
  4. Sell to customers either in person or virtually.

What businesses prioritize when picking suppliers

Every supplier choice involves 5 trade-offs:

  • Cost. The cheapest supplier helps margins.
  • Quality. A cheap component that fails costs more in returns and reputation than the savings.
  • Efficiency. How fast and reliably can the supplier produce at the volume needed?
  • Convenience. Geographic and logistical proximity to other suppliers and customers.
  • Risk. What's the chance this supplier breaks down?

Apple keeps a public Supplier Responsibility report[3] that lists every Tier-1 supplier and audits them on labor practices, safety, and environmental compliance. The list is part of how they manage supplier risk.

Where supply chains break

The risks are real and they happen often:

  • Natural disasters. A 2011 earthquake in Japan disrupted global semiconductor supply for months[6].
  • Geopolitics. US tariffs on Chinese goods, and the Russia-Ukraine war, which spiked oil and chip prices.
  • Resource shortages. A 2021 semiconductor chip shortage forced Ford and GM to idle factories[4].
  • Production errors. One bad component batch can force a replacement program across millions of units already sold.
  • Supplier reputation. When a supplier gets caught in a labor scandal (forced labor, child labor, unsafe conditions), the brand it supplies takes the public hit.

The October 2022 lockdown at Foxconn's Zhengzhou plant[2] (during China's zero-COVID policy) hampered iPhone production globally for weeks. That's how exposed even the world's most-prepared supply chain is to a single disruption.

Quick recap

  • A supply chain connects raw material acquisition through final customer delivery.
  • Goods supply chains: raw materials → components → assembly → storage → distribution → retail.
  • Services supply chains: employees + resources + delivery systems → sell in-person or virtually.
  • Suppliers are picked on 5 trade-offs: cost, quality, efficiency, convenience, and risk.
  • Top supply chain risks: natural disasters, geopolitics, resource shortages, production errors, and supplier reputation issues.

Try this week

Pick a product you bought recently. Search "[product] supplier list" or "made in [product]". Try to map at least 3 stages of its supply chain (raw material → component → assembly). Most major brands publish enough information to map this. The exercise teaches you why some products cost what they do.

References

  1. Count of the April 2024 Apple Supplier List: at least 175 Tier-1 suppliers, with manufacturing locations across 25+ countries and regions. Data as of the April 2024 Apple Supplier List disclosure. Source: Apple Supplier List, April 2024 (PDF)
  2. Foxconn's Zhengzhou campus is its principal iPhone assembly site; the 2022 COVID-19 lockdown there disrupted global iPhone supply. Data as of November 2, 2022. Source: CNBC, "World's largest iPhone assembly plant under new Covid lockdown in China." cnbc.com/2022/11/02/apple-iphone-assembly-plant-under-new-covid-lockdown-in-china-.html
  3. Apple publishes annual Supplier Responsibility reports listing Tier-1 suppliers and audit results. Data as of August 2026. Source: Apple Supplier Responsibility page. apple.com/supplier-responsibility/
  4. GM and Ford idled or cut production at several North American plants due to the 2021 semiconductor chip shortage. Data as of April 8, 2021. Source: CNBC, "GM and Ford cutting production at several North American plants due to chip shortage." cnbc.com/2021/04/08/gm-cutting-production-at-several-plants-due-to-chip-shortage.html
  5. Australia was the world's largest lithium-producing country in 2024, at 88,000 metric tons of mine production (Chile second at 49,000, China third at 41,000). Data as of 2024. Source: U.S. Geological Survey, Mineral Commodity Summaries 2025 (Lithium). pubs.usgs.gov/periodicals/mcs2025/mcs2025-lithium.pdf
  6. The March 11, 2011 earthquake and tsunami shut down Japanese factories making chips and car parts, straining the global electronics supply chain since Japan produces close to a fifth of the world's semiconductors. Data as of March 24, 2011. Source: Al Jazeera, "Japan quake strains supply chain." aljazeera.com/economy/2011/3/24/japan-quake-strains-supply-chain

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