The Evidence‑Based Investor (TEBI)

The Evidence‑Based Investor (TEBI)

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Robin Powell’s independent publication on evidence‑based investing, index/ETF usage and fees.

Why Policy Uncertainty Is a Terrible Guide to Investing
NewsApr 9, 2026

Why Policy Uncertainty Is a Terrible Guide to Investing

Policy uncertainty, measured by the Economic Policy Uncertainty Index, has surged to near‑record levels amid geopolitical tensions, yet the market‑risk gauge VIX remains only modestly elevated. Academic research shows the two metrics are weakly correlated (0.58) and often diverge, meaning...

By The Evidence‑Based Investor (TEBI)
Are Government Bonds Really Safe?
NewsMar 30, 2026

Are Government Bonds Really Safe?

Three centuries of UK and US government bond data reveal that bonds are safe in recessions but vulnerable during wars, pandemics and geopolitical shocks. Recent events have pushed 10‑year UK gilt yields to 5.07%, the highest since 2008, and a...

By The Evidence‑Based Investor (TEBI)
100 Years, 29,000 Stocks, 46 Winners: The Case for Indexing Just Got Stronger
NewsMar 20, 2026

100 Years, 29,000 Stocks, 46 Winners: The Case for Indexing Just Got Stronger

A new century‑long study by Hendrik Bessembinder shows that just 46 out of nearly 30,000 U.S. stocks accounted for half of $91 trillion in shareholder wealth creation, down from 89 firms in his 2018 analysis. The median stock delivered a -6.9%...

By The Evidence‑Based Investor (TEBI)
How Much of Your Portfolio Should Be in Stocks?
NewsMar 13, 2026

How Much of Your Portfolio Should Be in Stocks?

A new Yale working paper challenges the ubiquitous “100‑minus‑your‑age” rule for equity allocation, showing it costs investors about 2 % of lifetime consumption compared with the true optimum. The research treats future salary as human capital—a bond‑like asset that dramatically shifts...

By The Evidence‑Based Investor (TEBI)
The Hidden Cost of Trading in Retirement
NewsMar 11, 2026

The Hidden Cost of Trading in Retirement

A 2025 working paper tracking 59,105 Swedish investors shows that after retirement trading frequency rises by about 7.7% and portfolio holdings increase 8.2%, yet risk‑adjusted returns (Carhart alpha) fall roughly 0.6 percentage points. The same pattern mirrors the UK, where...

By The Evidence‑Based Investor (TEBI)
Does AI Accentuate Investor Biases?
NewsMar 10, 2026

Does AI Accentuate Investor Biases?

Investors are rapidly adopting AI tools for research and decision support, hoping the technology will eliminate emotional bias. Two recent studies, one from the CFA Institute and another by Bini et al., find the opposite: AI mirrors investor biases, especially attention...

By The Evidence‑Based Investor (TEBI)
Your Fund Family Has Outperformed? Yeah, Right
NewsMar 6, 2026

Your Fund Family Has Outperformed? Yeah, Right

The FT Alphaville piece exposes how active fund families, exemplified by Capital Group, cherry‑pick start dates, benchmarks, and gross‑of‑fees figures to make outperformance claims look better than they are. While Capital Group touts a 91% inception‑to‑2025 beat rate, net‑of‑fees numbers...

By The Evidence‑Based Investor (TEBI)
Scott Adams: Cartoonist, Divisive Commentator, Scourge of Active Managers
NewsMar 2, 2026

Scott Adams: Cartoonist, Divisive Commentator, Scourge of Active Managers

Scott Adams, the creator of Dilbert, used his globally‑read comic strip to launch a sustained critique of active fund management, portraying it as a costly scam through the character Dogbert. His personal experience—losing money to a Wells Fargo‑managed portfolio that invested...

By The Evidence‑Based Investor (TEBI)
Why Expected Returns Matter More than Index Concentration
NewsFeb 27, 2026

Why Expected Returns Matter More than Index Concentration

The S&P 500’s top‑seven stocks now represent more than 30% of market value, sparking industry warnings about concentration risk. Academic research shows this level mirrors historic peaks from the 1930s and is a natural outcome of firm‑specific volatility, not a market...

By The Evidence‑Based Investor (TEBI)
S&P 500 Concentration: The Scare Story That's Costing Investors Money
NewsFeb 18, 2026

S&P 500 Concentration: The Scare Story That's Costing Investors Money

New research by Mark Kritzman and David Turkington shows that despite recent headlines about the S&P 500’s rising concentration, the index’s current concentration is within historical norms. Using almost a century of data, they find that strategies that reduced equity exposure...

By The Evidence‑Based Investor (TEBI)