Fed Chair Nominee Warsh Says Fed Should Dig Deeper Into Productivity Implications Of AI; Increase In Capex Will Increase Demand A Few Tenths Of A Percent; On Supply Side, That Could Be Considerably Bigger; Can't Bank On That, But Need To Evaluate This Productivity Wave; Have To Make Judgements, And If Wrong, Have To Correct Them; Rate Decisions Are Very Hard Calls; Essential Fed Chair Is Open Minded To New Ideas; Essential Fed Chair Is Open Minded To New Ideas