The average bid on the benchmark Fannie Mae 30-year 3.50 percent MBS fell to 102.2 this week compared to 104.5 earlier in the month, leaving some market watchers feeling sick to their stomachs. The general fear is that MBS prices may fall further over the short term as interest rates rise. The question for many boils down to the basics: Where will mortgages settle? As Inside MBS & ABS went to press this week, the yield on the 10-year Treasury reached...