Sure, I can take a crack at it.
Essentially, what we are trying to protect against is dominant firms being able to exercise more market power because of specific conduct. This has undergone a recent change from the recent modernization of the Competition Act. In a nutshell, the old framework was a requirement to prove three things: first, market power, in other words, that the firm was big; second, conduct, the practice of an anti-competitive act; and third, the effect on competition.
After the changes to the Competition Act, we can now seek a prohibition order to stop the conduct if we have the first aspect, that the firm is dominant, and then we have one of two things: either a practice that was intended to harm competition or a competitor, or an effect. We'd be able to have a broader set of remedies if we could prove all three, but that is now a change that I think opens things up a bit for a prohibition order.
Predatory pricing is a bit particular, because we're looking at low prices, and we're mindful to approach these cases carefully to make sure we are not taking away from customers' competition on the merits and the benefit of low prices. However, the theory in the case of predatory pricing is a concern that it's a short-term low pricing, below the costs of the dominant firm, with a long-term effect of raising prices above the competitive level once they've been able to exclude or discipline their competitor.