How Survivorship Bias Is Costing You Money (And You Don't Even Know It)

How Survivorship Bias Is Costing You Money (And You Don’t Even Know It) Discover how survivorship bias—a cognitive trap born from WWII bomber analysis—distorts investment strategies, startup success rates, and trading decisions. Learn to see what’s missing. The Bullet Holes That Saved Thousands of Lives It’s 1943, and Allied bombers are getting shredded over Europe. Planes limp back to base riddled with bullet holes, and the top brass has a problem. Where do they add armor? The logical answer seems obvious—reinforce the areas with the most damage. ...

November 3, 2025 · 9 min · Josep Oriol Carné

Selecting an Open-Source DB for Financial Time Series

Choosing Your Data Engine: More Than Just Code When your algorithms depend on processing high-frequency data streams, or when you’re building ML models that need fast access to vast historical context, the time series database isn’t just a component – it’s the bedrock of your operation. A bottleneck here means missed opportunities, flawed analysis, or outright system failure. I’ve spent time evaluating the options because getting this wrong has consequences, especially when real capital or critical infrastructure is on the line. ...

April 6, 2025 · 8 min · Josep Oriol Carné