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 drives are CD and DVD compatible. The acronym after the hyphen tells you what you can do with that type of disc or that type of drive. -ROM: Read-Only Memory. You cannot write to a -ROM disc, which left the factory with data already on it. A -ROM drive can read discs but not write to them, and has no use at all for a blank disc. -R: Recordable. You can write to one of these discs once (provided you have an -R drive). But when you're done, it's effectively a -ROM disc. -RW: Rewritable.