Do I really need commodities in my portfolio?

Commodities have historically offered multiple layers of diversification
If the last five-year return period is proof of anything, it certainly demonstrates that commodities are typically diversifiers to traditional stocks and bonds. After all, at a time when commodities posted negative returns for five years ending June 30, 2017, the S&P 500® Index returned 14.63% and bonds (Bloomberg U.S. Aggregate Bond Index) posted a 2.21% return. Of course, past performance is no guarantee of future return, but, as the chart below shows, commodities have long exhibited less correlation with equities and bonds than other real assets (such as infrastructure and real estate), helping smooth the performance pattern of diversified portfolios.
The long-term outlook for commodities appears promising
According to the United Nations, the world’s population is estimated to grow by about 83 million people per year1 between now and 2030. This creates an ongoing and increasing demand for energy, food, and other real assets. Demand may very well exceed supply for many commodities in the years to come, which would support commodities prices.Commodities have the potential to help buffer against inflation
Historically, commodities have tended to outperform other asset classes, particularly equities, during periods of unexpected high inflation. That was certainly the case in the mid-1970s and periods of the 1980s when inflation reached nearly 15%. While we don’t expect inflation to rise to those levels anytime soon, an improving global economy has the potential to spur demand for commodity-related products, causing commodity prices to rise. As an investment, commodities may keep pace with the inflationary pressures that build as the economy rallies. While we have gone a long time without any meaningful inflationary pressures, an improving global economy could change that.The bottom line
Looking forward, we expect a commodities allocation commensurate with the investor’s risk tolerance to be additive to diversified portfolios. We believe investors have the potential to benefit from an asset class that has the may improve portfolio diversification, provide access to global growth, and act as a potential inflation buffer—particularly in today’s market environment.1 Source: United Nations World Population Prospects, 2017 Revision, https://esa.un.org/unpd/wpp/Publications/Files/WPP2017_KeyFindings.pdf