Paul Krugman’s 1978 paper models interstellar trade under special relativity, demonstrating that interest must be accounted in the stationary planetary frame to preclude arbitrage from time dilation effects on travelers (https://www.princeton.edu/~pkrugman/interstellar.pdf). The lede is that Krugman’s framework, written as an economic jest, directly anticipates finance and trade mechanics now relevant to emerging off-world markets.

Contemporary coverage on Hacker News treated the document as a curiosity from 1978 without linking it to current patterns; it missed explicit ties to SpaceX Starship development timelines, Astroforge asteroid mining missions, and projected $1T space economy valuations by 2040 cited in McKinsey’s 2023 space report. Krugman’s core equations on proper versus coordinate time in trade balances were not connected to these real-world accelerations.

Synthesizing the primary source with McKinsey’s “The Space Economy” (2023) and The Economist’s 2024 briefing on commercial space growth shows Krugman correctly identified that high-value, low-mass goods and information will dominate early trade routes due to relativistic costs and light-speed delays—patterns missed in most 2024 discussions that still apply terrestrial supply-chain models to lunar or Martian logistics.