Money market funds, such as CIB238 are mutual funds, which differ from PSA which is an ETF.
CIB238 has an MER of 0.19%, a minimum investment of $100,000, and it pays a yield of roughly 4.8%. This fund invests in money market instruments such as short-term bonds issued by various corporations and levels of the government.
The Purpose High Interest Savings ETF (PSA), on the other hand is an ETF which does not have a minimum investment amount. It invests in high-interest savings accounts with the major 6 Canadian banks. It has an MER of 0.15% and a yield of 3.4%.