06. De-mean part 1

Notional

A portfolio's notional is the number we can multiply the stock weights by in order to get a dollar value for each stock's position. For a long-only portfolio, we can think of this as the amount of cash that a fund has available to invest in the portfolio. Whether the positions are long or short, we can multiply the stock weight to the notional to turn this into a dollar amount for that stock's position.