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.
Newer storage mediums such as DVD-RWs [Digital Versatile Disc-Rewritable (DVD-RW): a blank disc that can be written to and rewritten to ] and memory sticks [memory stick: a thumb-sized portable storage device used primarily for transferring files between computers ] have replaced floppy/zip disks.