By Herbert Lash and Carolyn Cohn NEW YORK/LONDON (Reuters) – Global equities edged up and a key part of the Treasury yield curve inverted further on Friday, a sign the U.S. economy will stall next year and that investors hope will lead the Federal Reserve to back off its aggressive hiking of interest rates. Surprisingly strong retail sales data this week hammered home the idea that the Fed will tighten monetary policy further even though soft consumer and producer price pressures suggested inflation has peaked and would allow for lower rates. Treasury yields rose for a second day following haw…