What Is a Smart Beta ETF
An index simply 'holds more of the bigger companies.' But would holding more of 'cheap stocks' or 'rising stocks' be better? Smart beta turns that idea into a rule.
Market-cap weighting vs. smart beta
A typical index ETF uses 'market-capitalization weighting.' The bigger the company (the larger its market cap), the more weight it automatically gets. As a result, weight tends to concentrate in a handful of mega-cap firms.
Smart beta ETFs raise a question here. What if we set weights by criteria other than 'big'—such as 'cheap,' 'rising,' or 'sturdy'? Smart beta is a strategy that, instead of market cap, tilts holdings' weights according to a specific 'factor' under predetermined, rules-based logic.
It's easiest to understand it as sitting between fully passive (just tracking an index) and active (a fund manager's discretion).
The four representative factors
The representative factors smart beta commonly uses are as follows.
Value: holds more of stocks that are cheap relative to earnings or assets (low P/E, low P/B).
Momentum: holds stocks that have recently risen strongly, on the assumption that the trend will continue for a while.
Quality: picks 'high-quality' companies with good profitability and sturdy finances.
Low Volatility: holds stocks whose prices swing less, aiming to reduce drawdowns and smooth returns.
Beyond these, Size and Dividend Yield are also used as factors.
Not a cure-all: the ups and downs of factors
Smart beta aims for a better 'return per unit of risk' than market-cap weighting. But no factor always wins.
Factor leadership rotates depending on the market phase. Historically, growth and momentum have tended to be relatively strong during optimistic economic phases, while value and low volatility have been relatively strong during downturns. In other words, the factor you chose can underperform for several years.
In fact, the value factor lagged the market for much of the 2010s. You need to understand that smart beta is not a 'guarantee of excess returns' but 'a different bet that takes on different risks.'
It is impossible to predict which factor will be favorable going forward. Smart beta does not promise excess returns and can underperform the market for extended periods.
Preguntas frecuentes
Q. If smart beta is 'smart,' is it always better than an active fund?
No. The name 'smart' only means it weights factors on a rules basis instead of by market cap; it does not mean it guarantees better performance. It does have the advantages of transparent rules and generally lower fees than active funds, but if the chosen factor underperforms, it can do worse than a plain index.
Q. Is mixing several factors safer?
A 'multi-factor' strategy that blends several factors is an attempt to cushion the shock when one factor underperforms. Because each factor does well in different phases, you can expect a diversification effect. That said, blending can't eliminate losses, and there can still be periods when it lags the broad market.
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