In regards to stocks and corporate earnings this week, Alcoa is expected to post theirs after the market closes Wednesday. Therefore, it will have an impact on overnight and early morning trading Thursday. This company isn't necessarily key to gauging economic strength, but it is the first Dow component company that posts earnings each quarter. Since it is the first look into Dow-related earnings, it draws plenty of attention in the markets. However, there are plenty of other earnings releases that will also 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.