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.
Out of these two most popular ones are DVD-R and DVD-RW. Both allow users to record and store media files such as music or movies and run on all devices with DVD drives. The major difference between them lies in the number of times they can be used. Whereas DVD-R is known as readable DVD, DVD-RW is a rewritable DVD. This means that you can store files only once in a DVD-R and cannot erase and record another file on it, DVD-RW allows the user to erase and record information multiple number of times.