By JOE RENNISON Long-term government borrowing costs shot higher earlier this week, in a sign that investors doubt whether Kevin Warsh, the new chair of the Federal Reserve, will keep inflation contained. The 30-year Treasury yield, an indicator of what it would cost the federal government to borrow money for three decades, rose 0.11 percentage points to 5.22% on Wednesday, its largest one-day increase in more than a year, and its highest level since 2007. The move higher has ramifications…
