Define the market you would otherwise own.
Broad shares already include varied company characteristics. A factor rule deliberately changes their relative weights. A fund can follow an index while its investor chooses to depart from broader market-value weights.
Fix reference countries, sizes and weighting: geography can masquerade as a factor effect. Neither a next-quarter forecast nor a factor allocation is required.
The label does not specify the holdings.
Read the measured characteristic and portfolio rule. Momentum is not a personal trading signal, and low measured volatility is no capital guarantee. Familiar labels can have technical meanings.
Six families and the particular five-factor model
- Value
- Lower prices relative to specified company fundamentals; neither a low unit price nor proof of mispricing.
- Size
- Smaller company market values, not low unit prices or the amount you invest.
- Profitability/quality
- Specified profits, financial strength or earnings consistency; broad quality need not equal a profitability factor.
- Investment
- Slower versus faster growth in company assets: companies’ investment activity, not your savings contribution.
- Momentum
- Relatively strong past price performance under a specified process, not a personal timing instruction.
- Low volatility
- Lower measured fluctuation or construction using risk estimates, not protected capital or stable cash.
The French five-factor definition includes market, size, value, profitability and investment. Momentum, broader quality and low-volatility strategies are different frameworks. MSCI discusses several families; its history establishes no investor return.
Research spread and fund return measure different things.
Value basket 14%
Comparison basket 8%
14% − 8% = 6 percentage points spread
The value basket earns 14%, not 6%. A long-only fund combines market exposure with a tilt. A research construction that buys one group and shorts another has different financing, collateral and implementation. Its spread cannot simply be added to projected net fund returns.
Calculate the spread and identify the portfolios behind it
French’s size construction compares small versus large portfolios; value compares higher versus lower book-to-market portfolios. Those definitions specify the research series, not a similarly named fund’s net return.
Check holdings, permitted methods, financing and expenses before projecting wealth. Understanding the distinction requires no personal long–short trading.
The tilted shares remain shares.
Before · Broad shares €60,000 / bonds €40,000
After · Broad €45,000 / factor €15,000 / bonds €40,000
BroadFactorBonds
Same €15,000, two denominators:
€15,000 / €100,000 = 15% of all capital
€15,000 / €60,000 = 25% of shares
Neither portfolio percentage measures statistical factor exposure. The move creates neither fresh capital nor a defensive reserve: it changes which shares you own.
Keep both denominators and underlying risks visible
€15,000 divided by €60,000 gives the within-shares weight. Review overlap, geography and company concentration: the small-value fund can fall with broad shares.