房地美：美国上周30年期按揭贷款/抵押贷款利率6.81%，前值6.76%。

Group 1 - The core point of the article is that the average rate for a 30-year fixed mortgage in the United States increased to 6.81% last week, up from the previous value of 6.76% [1] Group 2 - The increase in mortgage rates may impact housing affordability and demand in the real estate market [1]