Source: https://mancuso.ai/writing/7515447118258548736/ [← All writing](https://mancuso.ai/writing/) ![Jevons' Paradox Ate Jev, page 1 of 5](https://mancuso.ai/images/writing/7515447118258548736/page-01.webp) ![Jevons' Paradox Ate Jev, page 2 of 5](https://mancuso.ai/images/writing/7515447118258548736/page-02.webp) ![Jevons' Paradox Ate Jev, page 3 of 5](https://mancuso.ai/images/writing/7515447118258548736/page-03.webp) ![Jevons' Paradox Ate Jev, page 4 of 5](https://mancuso.ai/images/writing/7515447118258548736/page-04.webp) ![Jevons' Paradox Ate Jev, page 5 of 5](https://mancuso.ai/images/writing/7515447118258548736/page-05.webp) 1 / 5 October 12, 2026 # Jevons' Paradox Ate Jev By Michael Mancuso · October 12, 2026 · Originally published on LinkedIn TypeSafe named its new AI model Jev, after William Stanley Jevons, the economist who noticed that when coal got cheaper to use, people burned more of it, not less. It was a clever name. It may also have been a prophecy. Jev launched on Sept. 15 with $40 million in seed funding. It doesn't chat. It answers typed questions with probabilities, so software can act on them. Within days, researcher Nandakishor Mukkunnoth argued he had published the core idea in March 2025, and released a free, open-source alternative called Laya. TypeSafe hasn't publicly responded, and reviewers say his earlier work was narrower. Who had the idea first is genuinely contested. What isn't contested is what came next. According to Tom's Hardware, within weeks there were decision models from Microsoft, OpenAI, Cloudflare, Perplexity and Amazon, plus open-source projects with names like OpenJev and NanoJev. That is Jevons' paradox applied to ideas. When copying a breakthrough gets cheap, you don't get fewer copies. You get a flood. A new idea used to buy you years. This one bought weeks. The moat isn't the invention anymore. It's whatever you can still do on Monday that the copies can't. Read slide text ### Slide 1 A name that aged fast. TypeSafe named its AI model after the man who explained why cheap things multiply. Jev, after William Stanley Jevons: when coal got cheaper to use, people burned more of it. ### Slide 2 The dispute. Who had the idea first is genuinely contested. March 30, 2025: Nandakishor Mukkunnoth posts SalesRLAgent to arXiv: a narrow model that outputs sales-conversion probabilities. September 15, 2026: TypeSafe launches Jev with $40M in seed funding. Typed questions in, probabilities out. September 18, 2026: Mukkunnoth says he built the core idea first, and releases a free open-source rival, Laya. TypeSafe hasn’t publicly responded. Reviewers note his earlier work was narrower. ### Slide 3 What isn’t contested. Then came the flood. Within weeks of Jev’s launch: Microsoft Decision; OpenAI Decisions API; Cloudflare Clef; Perplexity Decider; Amazon Strands Decider 2B; OpenJev · NanoJev · Ollaya · … ### Slide 4 The new half-life. A new idea used to buy years. Years → Weeks. This one bought weeks. ### Slide 5 Jevons, applied to ideas. When copying a breakthrough gets cheap, you don’t get fewer copies. You get a flood. The moat isn’t the invention anymore. It’s whatever you can still do on Monday that the copies can’t. Sources cited in the slides: TypeSafe AI, “Introducing System One Models & Jev,” September 15, 2026; arXiv 2503.23303; The Register, September 16, 2026; Dev.to, September 18, 2026; Tom’s Hardware, October 12, 2026. [On LinkedIn (opens in a new tab)](https://www.linkedin.com/feed/update/urn:li:activity:7515447118258548736/) [Explore more writing](https://mancuso.ai/writing/)