Circular Economy
What Is the Circular Economy?
The circular economy is an economic model designed to eliminate waste and keep materials in use for as long as possible. It contrasts with the linear economy (take–make–dispose) by creating closed loops where the output of one process becomes the input of another.
The concept was popularised by the Ellen MacArthur Foundation and draws on systems thinking, biomimicry, and industrial ecology.
Linear vs Circular
| Linear Economy |
Circular Economy |
| Extract raw materials |
Recover and regenerate materials |
| Manufacture product |
Design for longevity and disassembly |
| Sell to consumer |
Retain value through reuse, repair, remanufacture |
| Dispose at end-of-life |
Material flows back into production |
| Waste is an externality |
Waste is a design failure |
The Three Principles of the Circular Economy
- Design out waste and pollution — Waste is not inevitable; it results from design decisions. Choose materials and processes that eliminate waste at source.
- Keep products and materials in use — Maintain, reuse, remanufacture, and recycle to retain the embedded energy and labour in products.
- Regenerate natural systems — Return biological materials safely to natural cycles; restore rather than degrade ecosystems.
Circular Business Models
- Product-as-a-Service (PaaS): Manufacturer retains ownership; customer pays for use. Incentivises durability and repairability (e.g. Michelin charges per kilometre for tyres)
- Remanufacturing: Used products are returned, disassembled, inspected, and rebuilt to original specification
- Rental and leasing: Enables products to cycle through multiple users
- Take-back schemes: Manufacturers collect end-of-life products to recover materials
Circular Design Strategies
- Use recycled and recyclable materials
- Design for disassembly (DfD) — snap-fits, bolts, not adhesives
- Modular design — replace worn components, not entire product
- Durable materials — extend useful life
- Mono-material construction — simplify recycling
- Biological materials — compostable at end-of-life
Sustainability and Worldview Implications
- Circular economy reduces resource extraction and associated habitat destruction
- Requires systemic change: infrastructure for collection, sorting, and reprocessing
- Economic opportunity: circular businesses can generate revenue from waste streams
- Worldview dimension: challenges the culture of disposability and prioritises stewardship over ownership
KEY TAKEAWAY: The circular economy is a systemic redesign of production and consumption, not just recycling. It requires designers to think about the entire product lifecycle from the outset.
EXAM TIP: Distinguish the circular economy from recycling alone. Examiners look for understanding of the whole system: design, use, recovery, and re-entry into production.
APPLICATION: When designing a product, ask at each stage: how does this material return to use? Does the design make that recovery feasible?
