As 15-year mortgages have become a popular choice for refinancing borrowers, the proportion of 15-year supply recently outstripped the 30-year sector.

Since the start of this round of refinancing, the share of 30-year fixed-rate has declined by $68 billion. On the other hand, the 15-year share has increased by $48 billion, according to a recent report by JPMorgan Securities.

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