Generally, I believe holding a small amount of this stuff is a good idea. They can provide additional protection against a declining Dollar and serious inflation. But, they've had a tough year. If you hold any of this stuff, you're probably underperforming the broader markets. A few I track, YTD. Have owned all in the past, but only the two noted presently.
OPGSX (gold-prec.metals) -40.37%
QRAAX (commodities) -8.54%
OIBAX (international bond) -5.57% (own)
RPIBX (international. bond) -4.84%
PRAFX (natural resources) -2.61% (own)
As others have previously noted, if you own these highly cyclical sectors, periodic rebalancing is a good idea.
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http://www.reuters.com/article/2013/09/18/us-fund-commodities-arbalet-idUSBRE98H10220130918?feedType=RSS&feedName=businessNews