BMO Money Market Fund (ZMMK-T)

A short-term money market ETF is not going to be impacted by currency volatility. They're Canadian plays in Canada. Even though the BOC is a lot more aggressive in terms of cutting rates because the Canadian economy is significantly weaker than that of the US. 

ZMMK and ZST are his two favourite BMO ETFs for money market exposure. He uses both in the bond fund he manages. Which one you chose depends on your risk tolerance. Both are excellent, look at both.

Now paying 15-20 bps higher than a plain-vanilla high-interest savings ETF. Good if you need access to cash, never drops below where you bought it if you buy on the ex-dividend date. A cash-like position in your portfolio. Pays interest. 

The sawtooth graph is explained as money accumulating on short-term paper holdings, and then paid out all at once every month. You can, of course, automatically reinvest the proceeds.

He recommends "barbelling" it in with longer-term fixed income like ZAG.

Diversified. Perfectly fine (aka "boring") to hold a bit of this for a cash-like instrument.

In order to pay higher rates - added mortgage assets. Regulators not approving mortgage additions, so interest rates will fall on this product. 

Holds money market funds.
Providing short tern interest rate exposure.
High yields good for investors (~5%).
Safe & easy cash alternative.