The average rate on a 30-year U.S. mortgage fell this week to its lowest level in nearly 10 months, giving prospective homebuyers a sorely needed boost in purchasing power that could help inject life into a stagnant housing market.

The long-term rate fell to 6.58% from 6.63% last week, mortgage buyer Freddie Mac said Thursday. A year ago, the rate averaged 6.49%.

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