Fed Chair Powell Says Gasoline Prices Will Depend On How Long Strait Stays Closed; It's A Question If Spending Goes Down To Offset Inflationary Effects; Not Obvious If You Should Move Your Rate Because Of That; Fed Independence Is The Law; We've Had To Go To Court To Defend It; Fed Independence Goes Beyond The Law, Too; Need To Respect Boundaries Between Treasury And Fed; The Law Creates The Setting For Political Independence For Monetary Policy Decisions