The Globe and Mail reports in its Saturday edition that if there is cash building up in your on-line account, you will want to stow it somewhere that combines safety with at least a sniff of a decent interest rate. The Globe's Rob Carrick writes that recent trends in on-line brokers suggest it is time to add the treatment of cash-type investments to the list of things investors pay attention to when comparing brokers. The Purpose High Interest Savings ETF (PSA) is a good way to park cash. The management expense ratio for this fund is 0.11 per cent, and it yields 1.9 per cent. The PSA advantage is a higher yield than investment savings accounts. Questrade and Virtual Brokers charge nothing to buy ETFs, but is you're a client of RBC Direct or TD Direct, you cannot buy it. Both firms will not process orders for this ETF. "We determined PSA-TSX to be equivalent to a short-term savings product," an RBC official said in a statement. "We do not offer third-party short-term savings products." Like TD, RBC has a policy of offering clients just one product for parking cash. That would be the in-house offering -- the RBC Investment Savings Account for RBC Direct Investing and the TD Investment Savings Account for TD Direct.