[1] As such, it serves as the de facto floor for private-sector lending, and is the baseline from which common "consumer" interest rates are set (e.g. credit card rates).
In the United States, the prime rate is traditionally established by the Wall Street Journal.
The print edition of the WSJ is generally the official source of the prime rate.
The Wall Street Journal prime rate is considered a trailing economic indicator.
It changes only when the nation's "largest banks" decide on the need to raise, or lower, their "base rate".