There are major upticks in some of the commodity funds, Invesco's PDBC has been very popular. As far as any disadvantages go when pooling money into natural resource ETFs as a hedge against inflation, Nadig notes how this is still an investment in equities. "Gangbusters" is the word of choice for Nadig, who notes how this year is lining up to deliver an absolute record, and if flows continued at the pace they are currently at, ETFs would be on track for something close to a trillion dollars in net inflows.