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This article originally appeared on ETF.COM here.

There has been much debate about the “death” of the value premium. Those making the case it has disappeared believe the publication of research on the premium has led to cash flows, which in turn have eliminated it.

They point to the last 10 calendar years of data, during which the value premium was slightly negative, at -0.8%. The value premium (HML, or high minus low) is the annual average return on high book-to-market ratio (value) stocks minus the annual average return on low book-to-market ratio (growth) stocks.

Before taking a deeper dive into the data, it’s important to note that all factor premiums, including market beta, have experienced long periods of negative returns. The following table, covering the period 1927 through 2017, shows the odds (expressed as a percentage) of a negative premium over a given time frame. Data in the table is from the Fama/French Data Library.

 

1-Year

3-Year

5-Year

10-Year

20-Year

Market Beta

34

24

18

9

3

Size

41

34

30

23

15

Value

37

28

22

14

6

Momentum

28

16

10

3

0

No matter the horizon, the value premium has been almost as persistent as the market beta premium. Even the market beta premium has been negative in 9% of 10-year periods and in 3% of 20-year periods.

Changing regimes

Investors who know their financial history understand that what we might call “regime change,” with value underperforming for a fairly long time, is to be expected. In fact, even though the value premium has been quite large and persistent over the long term, it has been highly volatile. According to Ken French’s data, the annual standard deviation of the premium, at 12.9%, is 2.6 times the size of the 4.8% annual premium itself (for the period 1927 through 2017).