Event-Based Time
Event-based time is the principle that the meaningful unit for measuring time is not the clock second but the discrete event. Whether in high-frequency trading, a human lifetime, or all of recorded history, clock-time produces misleading comparisons while event-counts produce stable ones.
The Trading Origin
At a high-frequency trading firm, benchmarking performance using clock-time fails because different assets generate orders at radically different rates. NVDA might have thousands of order-book updates in the same clock interval that a low-liquidity stock updates its price once. Comparing the two using seconds produces noise.
The solution is to normalize by market events — trades, cancellations, price updates — instead of by seconds. Event-based benchmarks are stable across asset types and generalize strategies more effectively.
In always-on crypto markets, the same logic identifies "hot zones": the few hours per day when real price-relevant information moves. Event density predicts meaning; clock-time does not.
Paul Janet's Ratio-of-Life
At the scale of a human life, the same principle appears in subjective time perception. At age 10, a single year represents 1/10th of your entire memory bank — 10% of everything you have experienced. By 50, that same year represents only 2%. Each calendar year shrinks in proportion to total accumulated experience.
The implication is stark: by age 22, you have subjectively "spent" roughly half your felt lifetime. Unless you continue filling life with genuinely novel events, each calendar year compresses subjectively. Time contraction is a form of personal decay — as predictable as inflation eroding savings or aging eroding physical performance.
The corrective is not to slow down but to pack more novel events, new environments, and unfamiliar experiences into each year. Each genuinely new experience is a larger unit of subjective time.
Human History in Life-Years
At the civilizational scale, the same event-based lens produces a striking reframing of history. Total accumulated human experience can be measured in life-years (one person alive for one year). The total is approximately 1.6 trillion life-years.
The distribution:
- 50% of all lived human experience occurs after 1500 CE
- 25% after 1945
- 10% after 2003
- Each current calendar year now represents roughly 0.5% of all human experience ever
While individual lifetimes experience time on a log scale (each year shrinks relatively), the collective experiences it on an exponential scale. Population growth compresses millennia of historical experience into decades of lived-time. The individual and the collective are moving in opposite directions.
The Fractal
The same principle appears at every level of resolution:
- HFT: normalize by order-book events, not seconds
- A life: pack it with novel events to stretch subjective duration
- History: population growth makes recent centuries contain the majority of all human experience ever lived
This is a fractal: the same measurement insight — events matter more than clock-time — applies at the micro, human, and civilizational scale.