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https://philippdubach.com/posts/behavioral-economics-transit-policy/ Why Free Transit Feels Revolutionary: The Zero Price Effect - philippdubach.com May 4, 2026 - The zero price effect explains why politicians love free transit proposals. But making buses free might weaken the rider advocacy that protects service quality. free transit zero price feels revolutionary effect https://philippdubach.com/posts/the-rise-of-middle-power-realism/ Middle Power Realism: Carney's Davos Speech and the New Order - philippdubach.com Feb 23, 2026 - At Davos 2026, Carney told allies to take down the signs of the liberal order. Middle powers are learning to navigate between giants without illusions. middle power davos speech new order realism carney https://philippdubach.com/posts/trading-on-market-sentiment/ GPT-3.5 vs RavenPack: Sentiment Analysis Trading Strategy - philippdubach.com May 4, 2026 - GPT-3.5 matched RavenPack's 41% returns in a sentiment analysis trading strategy using 2,072 news headlines. See the full backtest results and comparison. gpt 3 5 sentiment analysis trading strategy vs philippdubach https://philippdubach.com/about/ About - philippdubach.com Philipp D. Dubach is a strategy consultant and independent researcher in quantitative finance and machine learning. philippdubach https://philippdubach.com/posts/my-first-optimal-portfolio/ Python Portfolio Optimization: From Theory to Publication - philippdubach.com May 4, 2026 - How I built Python portfolio optimization tools, tripled the Sharpe ratio from 0.65 to 1.68, and published the results as an academic paper on MPT. portfolio optimization python theory publication philippdubach https://philippdubach.com/posts/dual-mandate-tensions/ Fed Dual Mandate Tensions: Tariffs as Cost-Push Shocks - philippdubach.com Feb 23, 2026 - New NBER paper shows optimal Fed policy should partially accommodate tariff inflation, exposing a fault line in the dual mandate when prices and jobs conflict. dual mandate fed tensions tariffs cost https://philippdubach.com/posts/beyond-monte-carlo-tensor-based-market-modeling/ Tensor-Based Market Modeling: A Monte Carlo Alternative - philippdubach.com Feb 23, 2026 - UBS paper uses Transition Probability Tensors to bridge machine learning and arbitrage-free derivatives pricing, offering a faster alternative to Monte Carlo. based market monte carlo tensor modeling alternative https://philippdubach.com/posts/is-ai-really-eating-the-world-1/2/ AI Model Commoditization: $400B in Capex, 97% Price Drop - philippdubach.com Mar 15, 2026 - Hyperscalers spend $400B on AI, API prices drop 97%, and DeepSeek builds frontier models for $500M. Value is flowing to applications, not model providers. ai model price drop 400b capex 97 https://bsky.app/profile/philippdubach.com @philippdubach.com on Bluesky Blog about Personal Projects, Articles and Papers on Economics, Finance and Technology. 🤖 This account automatically shares the latest blog posts. 🌐... philippdubach bluesky https://philippdubach.com/posts/dont-go-monolithic-the-agent-stack-is-stratifying/ Enterprise AI Agent Stack: Agentic AI Architecture Where Context Beats Models - philippdubach.com Feb 23, 2026 - The enterprise AI agent stack is stratifying into six layers with different winners at each. Models commoditize; context — your organizational world model —... enterprise ai agent stack agentic architecture context beats