as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
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how are mortgage interest rates determined?
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sheegan has a great explanation of how the tba market contributes to  mortgage rates. the 30 year mortgage rates are closely tied to the 10-year treasury.  one can track this rate at many stock quoting sites using symbol tnx.
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