We will also be watching corporate earnings as their postings get more plentiful and mortgage important. Alcoa is expected to post their results after the market closes today. Therefore, it will have an impact on overnight and early morning trading tomorrow. This company isn't necessarily key to gauging economic strength, but it is the first Dow component that posts earnings each quarter. Since it is the first look into Dow-related earnings, it draws plenty of attention in the markets. There are also plenty of other earnings releases that will be in the spotlight. Generally speaking, weaker corporate earnings translates into stock selling that makes bonds more attractive to investors. As bond buying pushes prices higher, yields fall and mortgage rates usually track bond yields.