Mish Shedlock via Market Oracle:
As of March 31, their 7-Year Asset Class Real Return Forecast is as follows.
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Feb 2010
"Grantham’s ‘Horrifically Early’ Calls Challenge GMO"
March 2014
How Good Is Jeremy Grantham's Forecasting Record?
His strong pessimism drives GMO managed funds toward the most stable (large capitalization) value stocks, and these funds have performed fairly well (reflecting perhaps a value premium rather than market timing).
See also:
GMO 7-Year Asset Class Real Return Forecasts: 2007
From James Montier’s GMO Quarterly Letter, July 2013, titled The Purgatory of Low Returns, download the full PDF here (registration may be required).
GMO 7-Year Asset Class Forecasts - June 2012
Grantham Mayo 7-year Asset Class Real Return Forecast June 30, 2013
And Sept. 2009
Jeremy Grantham: "GMO’s 7-Year Asset Class Return Forecast"