When configuring sites, you have two properties related to price groups: the default price group and additional price groups. Consider the following scenario:
Site US has the US Dollar price group set as its default price group.
Site Canada has the Canadian Dollar price group as its default price group, but needs a second price group for US dollars.
It can either share the US Dollar price group with Site US or have a separate US Dollars2 price group.
Under what condition should Site Canada use the separate US Dollars2 as its additional price group?