1. Fluctuations of aggregate economic activity. 2.Cycles Expansion/Boom and Contraction/Recession. Peak and Trough: They are the turning Points of the business cycle. 3. Comovements of many macro variables over the business cycle.
Section 5: Using external media: CDs, DVDs and removable USB storage devices. â¢ dvd-r:until about 2005 the most common and portable format; cannot be erased or reused. â¢ dvd-rw:are-writable version of-rformat, similar to cdrw format CD discs.
Drives with DVD Multi logo can read and write DVD-R/RW and DVD-RAM discs, and read DVD-Video and DVD-ROM. Some may also play DVD-Audio and/or DVD+R/RW discs. Version 1.1 is the current version (as of September 2009).