"Common characteristics" refers to the similarities or traits that people or things share. It means that they have certain qualities or features in common, or that they are similar in some way. Full definition
The theory here is that to the people that share common characteristics of personality, or complementary characteristics, inherently better will be combined and better served for itself. (adultfindout.co.uk)
Likewise, on the surface, ETFs and mutual funds generally share common characteristics such as liquidity and diversification. (hartfordfunds.com)
Common characteristics In several respects, private and public REITs have a lot in common. (nreionline.com)