Offer your insights or judgment on the input financial query or topic using your financial expertise. Reply as normal question answering

What are the risks with ETFs with relatively low market caps?
Market cap probably isn't as big of an issue as the bid/ask spread and the liquidity, although they tend to be related. The spread is likely to be wider on lesser traded ETF funds we are talking about pennies, likely not an issue unless you are trading in and out frequently. The expense ratios will also tend to be slightly higher again not a huge issue but it might be a consideration. You are unlikely to make up the cost of paying the commission to buy into a larger ETF any time soon though.