Your phone’s GPS works partly because Einstein was right about time. GPS satellites carry atomic clocks. Because they move quickly, relativity makes their clocks tick about 7 microseconds slower per day than clocks on Earth. But because they experience weaker gravity in orbit, their clocks tick about 45 microseconds faster. Net effect 38 microseconds per day. That sounds microscopic. It isn’t. Without correcting for it, GPS positioning errors would accumulate by roughly 10 kilometers per day. The remarkable part is what this says about systems built on measurement. A tiny error in something nobody notices can become enormous when repeated across a complex system. Markets have the same property. A timestamp slightly wrong. A price feed slightly delayed. A corporate action applied incorrectly. A tiny data error repeated millions of times. The individual error looks harmless. The system doesn’t care how small it was. Small errors become large when the system gives them enough time to compound. #Trading# #QuantFinance# #MarketData# #SystemsThinking#