{
  "schema": "vedokrok.public-item.v1",
  "release_id": "MHC-RPUB-20260920-75ad787a",
  "url": "/knowledge/weight-a-purchase-by-how-much-of-your-life-it-touches",
  "id": "MHC-D-RESEARCH-9051",
  "version": "0.1.0",
  "title": "Weight a purchase by how much of your life it touches",
  "summary": "A small improvement repeated every day can matter more than a large improvement you meet twice a year.",
  "kind": "heuristic",
  "body": "Start with interaction, not prestige. Estimate how often the item is used, how long each use lasts, what friction or failure it can remove, and how many years you expect to keep it. Give more attention and budget to items with high repeated exposure only when the extra money buys a property you can name: better fit, reliability, repairability, support, speed, safety or lower recurring friction. High contact raises the value of a real improvement; it does not make a premium price automatically sensible.",
  "limits": [
    "Frequency is only one factor. Safety, accessibility, one-off catastrophic risk, family needs or a hard budget can outweigh interaction time."
  ],
  "topics": [
    "union-interaction-weighted-purchases"
  ],
  "intents": [],
  "source_ids": [
    "RS-38FAB1598536D55D"
  ],
  "evidence": [
    {
      "claim": "Life-cycle cost analysis compares alternatives over a defined service period instead of treating the initial purchase price as the only cost.",
      "source_id": "RS-38FAB1598536D55D",
      "role": "contextualizes",
      "note": "The NIST method is designed for federal energy and building decisions; personal cost-per-use calculations are a simplified editorial adaptation.",
      "locator": "Life-cycle cost method"
    }
  ],
  "use_when": [
    "You are deciding where paying more may be rational across items such as a bed, phone, computer, watch, chair, shoes or work tool."
  ],
  "avoid_when": [
    "Frequency is only one factor. Safety, accessibility, one-off catastrophic risk, family needs or a hard budget can outweigh interaction time."
  ],
  "example": "A laptop used eight hours most workdays deserves a more careful fit, reliability and support decision than a decorative device used once a month, but the expensive laptop still has to improve the actual workload.",
  "check": "You can name the repeated interaction, the improvement being bought and the expected service period without using brand prestige as the argument.",
  "sources": [
    {
      "id": "RS-38FAB1598536D55D",
      "title": "Life Cycle Cost Manual for the Federal Energy Management Program",
      "url": "https://www.nist.gov/publications/life-cycle-cost-manual-federal-energy-management-program"
    }
  ],
  "relations": [
    {
      "from": "MHC-D-RESEARCH-9051",
      "to": "MHC-D-RESEARCH-9052",
      "type": "use_before",
      "url": "/knowledge/translate-the-premium-into-cost-per-use"
    },
    {
      "from": "MHC-D-RESEARCH-9051",
      "to": "MHC-D-RESEARCH-9054",
      "type": "use_before",
      "url": "/knowledge/treat-repairability-and-support-life-as-part-of-the-price"
    }
  ],
  "collections": [
    {
      "id": "RC-74CA3FEDEC162686",
      "title": "Spend more carefully on the things that touch your life most",
      "url": "/collections/spend-more-carefully-on-the-things-that-touch-your-life-most"
    }
  ]
}