1.  There are two definitional syntheses that have a particular currency, both in everyday discourse and among scholarly approaches.

2.  Higher rates make deposits in a particular currency more attractive.

3.  What they actually do is to borrow the particular currency from foreigners or locals and then sell this currency for US dollars.

4.  Some technical details, such as the extent of the new margins and the problem of interventions to support particular currencies, remain to be settled.