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.
Some discs are read-only &lpar;ROM&rpar;, others allow you to burn content &lpar;write files&rpar; to the disc once &lpar;such as a CD-R or DVD-R, unless you do a multisession burn&rpar;, and some can be erased and rewritten over many times &lpar;such as CD-RW, DVD-RW, and DVD-RAM discs&rpar;.