DYI Comment:  As much as I admire Benjamin Graham if alive today would be awestruck by the Federal Reserve’s MASSIVE security market intervention.  Not just a U.S. phenomenon including world wide central banks insane money printing operations.  This has distorted security markets with their sub atomically low interest rates so much so fooling investors into thinking that current price/valuations to be reasonable.  Ben Graham’s formula is now very close for dollar cost averaging into common stocks!  Times are different as speculation – due to massive central bank distortions – is now the new investment process.      

Margin of Safety!

Central Concept of Investment for the purchase of Common Stocks.

"The danger to investors lies in concentrating their purchases in the upper levels of the market..."

Stocks compared to bonds:

Earnings Yield Coverage Ratio - [EYC Ratio]

EYC Ratio = 1/PE10 x 100 x 1.1 / Bond Rate

1.75 plus: Safe for large lump sums & DCA

1.30 plus: Safe for DCA

1.29 or less: Mid-Point - Hold stocks and purchase bonds.

1.00 or less: Sell stocks - Purchase Bonds

Current EYC Ratio: 1.27(rounded)

As of  2-1-20
Updated Monthly

PE10 as report by Multpl.com

Bond Rate is the rate as reported by

Vanguard Long-Term Investment-Grade Fund Investor Shares (VWESX)

DCA is Dollar Cost Averaging.
Lump Sum any amount greater than yearly salary.

PE10  ..........30.84
Bond Rate...2.80%

Over a ten-year period the typical excess of stock earnings power over bond interest may aggregate 4/3 of the price paid. This figure is sufficient to provide a very real margin of safety--which, under favorable conditions, will prevent or minimize a loss......If the purchases are made at the average level of the market over a span of years, the prices paid should carry with them assurance of an adequate margin of safety.  The danger to investors lies in concentrating their purchases in the upper levels of the market.....

Common Sense Investing:
The Papers of Benjamin Graham
Benjamin Graham