{"id": "card_econ_time_value", "kind": "reference", "title": "The time value of money — compound interest", "body": "A dollar now is worth more than a dollar later: compound interest grows it (sealed on the economics stick), present value discounts it back, and the rule of 72 estimates the doubling time. The arithmetic of time and money. Rests on the instruments.", "source": {"label": "Narrow Highway — economics", "url": "", "authority_tier": "engine_derived"}, "shelf": "codex", "box": "economics", "bands": ["economics", "pillar", "time_value", "one map"], "subject": "The time value of money — compound interest", "connections": [{"to_card_id": "card_floor_economics", "relationship": "part_of", "evidence": "a pillar of economics (The time value of money)"}, {"to_card_id": "card_floor_the_instruments", "relationship": "connects_at", "evidence": "compound interest, present value and the rule of 72 - sealed finance arithmetic"}], "author": "engine", "created_at": 0.0, "updated_at": 0.0, "visibility": "public", "lifecycle_stage": "public", "volatility": "permanent", "surface": "secular", "generated": false, "call": "codex.economics", "facets": {"subject": ["one map", "pillar", "time_value"]}, "presentation": {"glyph": "•", "kind_label": "economics", "by": "Narrow Highway — economics", "authority": "engine_derived", "posted": "", "standing": ""}, "neighbors": [{"id": "card_floor_economics", "title": "Economics — minds that choose, meeting scarcity", "relationship": "part of", "why": "a pillar of economics (The time value of money)", "href": "/card/card_floor_economics", "resolved": true}, {"id": "card_floor_the_instruments", "title": "The instruments — every verifier and validator, and where they join", "relationship": "connects at", "why": "compound interest, present value and the rule of 72 - sealed finance arithmetic", "href": "/card/card_floor_the_instruments", "resolved": true}], "house": {"door": "FIND", "kind": "card", "trail": "connections", "seal": "/card/card_econ_time_value", "next_step": {"do": "follow a connection: what this card rests on, and what rests on it", "door": "FIND", "tool": "card_connections", "params": {"id": "card_econ_time_value"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}