Many borrowers do not want to be surprised at the close of the transaction with a rate which is higher than what was quoted at the beginning of the process. Hence, many borrowers ask that the lender commit or "lock" the initial rate quoted for a period of time sufficient to close the transaction.

When a rate is "locked" the lender is being asked to guarantee the price of a commodity, the price of which changes daily. (Check out the daily changes in the bond market, which is a measure of the price of money on a daily basis.) The longer the lock period, the riskier the position of the lender, hence the higher the loan price (points) charged the borrower.

 

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