Free Software Download - YEd
YEd is a free application that helps you create diagrams and visual presentations. It supports Windows, Mac and Linux operating systems and features a friendly user interface. You can manually drag and drop elements and re-order them for better clarity. The program also supports GEDCOM genealogy format, which allows you to import your family tree and tag trees from other programs. Despite its free status, it is suitable for small enterprises and quick diagrams. You can find release notes for previous yEd versions on their website.
Income elasticity of demand is a useful tool for governments and firms, and it is the relationship between income and demand. YED can be positive or negative. A positive YED means an increase in demand for a normal good, while a negative one implies a decrease in demand for an inferior good. For example, a person who earns PS19,000 in 2004 can purchase 500,000 units of Product A in 2005 for the same price. In this case, the YED of a good would be -3,125, while the elasticity of demand for a poorer good is negative.