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.
The first writable DVD format, DVD-R is a write-once, read-many storage format, similar to CD-R. Book E. The second of the writable DVD formats, DVD-RAM must be handled in special devices, which do not fit into ordinary DVD drives.