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.
ROM = Read Only Memory (a cd or dvd which can be read but not written) RAM = Random Access Memory - this is a tricky one. As far as DVD-RAMs go the name is a bit misleading, and some ppl with think of normal RAM immediately but basically you should think of DVD-RAM as a DVDRW but with more features and advantages.