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.
A CD drive is an optical drive (a piece of hardware that reads Compact Discs). A DVD drive is an optical drive (a piece of hardware that reads DVD Discs). There are lots o â¦ f optical drives that can read both DVDs and CDs, some can even 'burn' information onto blank discs. ___________________ From: TheAllKnowingEye.