If the actual forward price is expensive relative to the “synthetic” forward (call + put options), an arbitrageur will engage in risk-less arbitrage by selling the expensively priced forward and buying the relatively cheap “synthetic” forward (call + put options) and vice versa!
We decided to adjust the program to a target of $ billion weekly net purchases of Government of Canada bonds. That is down from a minimum of $ billion per week, while we will be maintaining broadly the same maturity composition of our purchases.