Treasuries Return Most in a Month Since August as Growth Cools

Treasuries had their biggest monthly return since August as cooling economic growth and the Federal Reserve’s commitment to sustain monetary stimulus spurred demand for the safety of government debt.

Two-year note yields had the biggest monthly drop since January 2010 as business in the U.S. grew less than forecast and consumer-spending growth slowed. Ten- and 30-year debt rose today amid month-end buying. Fed Chairman Ben S. Bernanke said this week the central bank will finish buying $600 billion of debt in June, as planned, while holding interest rates at almost zero, where they’ve been since December 2008.