FYInance

Archive for January, 2010

iPortfolio is an excellent iPhone/iPod touch stock portfolio app. Simple and elegant. Track your US stock portfolios instantly without creating account and registration. Stock quotes, portfolio performance, gains/losses just by one tap on your iPhone/iPod screen.

If you're new to FYInance, we're going to make it worth your while to subscribe to our FYInance RSS feed. It will keep you up to date, on your terms!

Stamp Day for Superman is a 1954 short film starring George Reeves as Superman and Noel Neill as Lois Lane. It was produced by Superman Inc. for the US Department of the Treasury to promote the purchase of US Savings Bonds. Never shown theatrically, it was distributed to schools as a means of educating children about the program. www.youtube.com … superman clark kent metropolis daily planet savings bonds stamps tv educational

Here I use Mathetmatica to illustrate how the first derivative of the price of a zero-coupon bond (with respect to yield) is the dollar duration of the bond. Notice that the first derivative, as the slope of the tangent line, is not the same thing as “duration.” Rather, the first derivative is the dollar duration and it is “infected” by the bond’s price. That means, in this case (ie, continuous compounding), we can divide out the price to get the modified duration (30 for a zero coupon bond …