Money
Monetary systems demonstrate remarkable resilience when considered historically. Currencies have survived wars, revolutions, technological transformations, and governmental collapses. The pound sterling has maintained continuous existence since approximately 775 AD—over twelve centuries of operational reliability. The US dollar has functioned as global reserve currency for nearly eighty years. Money, as a concept, has proved extraordinarily difficult to destroy.
Yet individual currencies fail with troubling regularity. Hyperinflationary episodes have rendered currencies worthless in Germany (1923), Zimbabwe (2008), Venezuela (2018), and dozens of other cases. Bank failures periodically eliminate deposits. Exchange rate fluctuations can halve purchasing power within months. Money's reliability depends entirely on the institutions that guarantee it—institutions that prove fallible with disturbing frequency.
Modern financial infrastructure has introduced new reliability concerns. Electronic systems that process the vast majority of monetary transactions remain vulnerable to cyberattacks, software failures, and infrastructure disruptions. The 2010 ''Flash Crash'' eliminated and restored approximately $1 trillion in market value within minutes. Cryptocurrency systems have demonstrated that monetary instruments can lose 70 percent of their value in months. Money is reliable in aggregate and over long periods; it is less reliable in specific instances and at specific moments.
Rocket
Rocket reliability has achieved levels that would have seemed miraculous to early practitioners of the art. The Falcon 9, currently the world's most frequently launched rocket, has achieved a success rate exceeding 98 percent over more than 300 missions. The Soyuz rocket, with over 1,900 launches since 1966, maintains similar reliability statistics. Modern rockets fail approximately once in fifty launches—a rate that, while terrifying for passengers, represents extraordinary engineering achievement.
Yet rocket failures, when they occur, prove catastrophically total. A rocket does not partially fail; it explodes, killing any occupants and destroying its payload entirely. The Challenger and Columbia disasters each killed seven astronauts. Uncrewed failures have destroyed payloads worth hundreds of millions of dollars. The rocket operates in a domain where partial reliability is impossible—either the propellant ignites correctly and structural integrity holds, or everything is lost.
The physics of rocketry impose fundamental reliability constraints that engineering cannot fully overcome. Rockets operate at the extreme edge of material capabilities, with components stressed to near-failure thresholds. They contain vast quantities of stored energy in forms eager to release explosively. They must function perfectly through temperature ranges spanning hundreds of degrees. The rocket's reliability is remarkable given its operational envelope; that same envelope ensures failures will remain non-zero regardless of engineering improvements.
VERDICT
The reliability comparison favours money through the mechanism of graceful degradation. When monetary systems partially fail—through inflation, currency fluctuation, or institutional weakness—value is reduced but not eliminated. A currency that loses half its value remains half a currency. A rocket that fails is debris.
Furthermore, money has demonstrated reliability across historical timescales that rocketry has not had opportunity to match. Currencies have operated continuously for over a millennium; rocketry has existed for under a century. The sample sizes differ by an order of magnitude, and money's track record across that extended sample suggests fundamental robustness that rocketry has not yet proved. In reliability, money achieves victory through the competitive advantage of failing gradually rather than explosively.